Are reptiles warm blooded?

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No: by definition, they are cold blooded. Their body temperature fluctuates with the conditions of their environment, and they require external heating (e.g. sunlight or for those in captivity, heat lamps) to warm them up sufficiently to undertake "normal" activities.
Cold bloodedness used to describe them is misleading, however, leaving one to believe that their blood is always cold. The term herpetologists (a person who studies reptiles & amphibians) use is poikilothermal. This means, as described above, that their body temperatures changes with their surroundings. Their body will feel cold if the ambient temperature is cold and warm if the ambient tempertature is warm.
- Actually the above is answer is incorrect, neither "cold-bloodedness" nor "warm-bloodedness" define any group of animals, as that only loosely refers to their metabolisms, which vary across and within various animal groups.
Poikilothermy refers to variation in body temperature.
Homeothermy refers to maintenance of a steady body temperature.


For example: Birds are reptiles by definition and diagnosis and are endothermic or "warm-blooded", but some are homeothermic and some are poikilothermic.
The same can be said about many mammals.
The truth is that some reptiles are, or were endotherms (create their body heat metabolically) and that some are, or were ectothermic (raise their temperature from ambient external sources).


Other reptiles such as extinct dinosaurs and pterosaurs, were also endothermic based on tremendous amounts of data.


The metabolism of animals should not be considered in black and white terms, there is a continuum along which many metabolic strategies are used by different critters.

- There needs to be more clarification than presented in the previous post. Truly warm blooded is a polyphyletic trait that can be found across multiple different families of organisms and it generally has occurred due to a Lamarckist evolutionary characteristic in which was founded that organisms that begin to act upon habit upon traveling into different environments would begin to develop a system of internal metabolism of what we call Warmblooded, but of course there are three distinguish characteristics of warm blood and different variations of those three characteristics.

It is important to note that Crocodiles do in fact come from a cold-blooded organism, but relative isolation to sole and single environment had reverted them back to cold-blooded organisms. This is also true when it comes to Bats who aren't truly warm-blooded organisms and spend a great amount of their time in a single-sole environment, thus less need for adaption and as a result more fixation on environmental survival instead. The bird, which was its relative probably wasn't so fortunate to be in such a marshy environment as the Dinosaur Age began to end and thus remained warm blooded, because it still had to adapt to a changing environment.

It just points out how important the environment to an organism is on how it will evolve.

Nevertheless, being warm blooded is ultimately a significant factor in order to develop into a highly advance and intelligent species. Other two important characteristics are an ambush predatory behavior and a physical design that allows the act of grabbing and using material from the ground, something we take for granted, called hands.

Human evolution had occurred on the first remark of being a warm-blooded descendent of synapsids, which a division of amniotes that bounds us to birds and reptiles. The term reptile is generally incorrect nowadays, we instead use saurapsid to include not only reptiles but also birds. Due to the fact that certain reptiles such as Crocodiles are closer related to birds than they are to other reptiles.

The next important step to our evolution was developing hands to grab things, which we ultimately acquired by being a descendent of an arboreal organism called a Lemur, which makes us Primates.

Following that we had to develop an ambush predatory behavior, which can be seen in chimps and is a reason why we are both members of the Hominina Tribe and why Chimps are our closest primate relative, beside the fact we both don't have tails (which is why otherwise we could been more closer related baboons).

I hope that resolves a lot of difficulty on understanding cold-blooded and warm-blooded organisms as well as evolution and as it pertains to humans and intelligence.
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Why are reptiles cold-blooded?

Answer . reptiles blood is not really cold, it just means that when reptiles are in the shade they cool down and when they go into the sun they can warm up. the difference between the warm blooded is that warm blooded does not cool and heat as much as the cold blooded. reptiles need it so they can withstand the temperature.

Why is blood warm?

Blood, like all other bodily fluids, is the same temperature as thebody's normal internal temperature. This is 98.6 degreesFahrenheit, or 37 Celsius.

Are reptiles cold blooded?

Actually, reptiles are ectotherms which means their bloodtemperature is affected by their surroundings (and their behaviourto some extent). Their blood will be cooler in cooler environments.But they operate best with warmer blood like us, so they bathe inthe sun and find sources of heat to warm themselves up. Mammals, by contrast, are endotherms meaning our temperature iscontrolled internally to a greater extent. The disadvantage of thisis that we burn a lot of our food just heating ourselves. Reptilesput more of their food into gaining mass.

Why are reptiles cold blooded animals?

Reptiles are indeed "cold blooded" animals. This means that they are unable to self regulate their body temperature. If they get too cold, they get sluggish and slow and have to lay out in the sun to increase their body temperature. If they get hot, they have to hide in the shade or burrow in the sand to get out of the sun to prevent over heating. Humans are "warm blooded" we can do things like shiver when we are cold to increase our body temperature or sweat when we are hot to lower our body temperature.

Do reptiles have red blood?

Yes, reptiles have red blood. The red color is caused by hemoglobin in the red blood cells.

Are there any warm blooded reptiles?

Yes and No. As of now, there are no living, warm blooded reptiles (except perhaps birds). But there were warm blooded Reptiles. The Dinosaurs were warm blooded, the reason why we know this is because of there natural size. Science dictates that to reach that sice they had to have two things, 1 extra oxygenated air and 2 a self sufficient internal heating source. edit: this is untrue. Leatherback turtles are warm blooded, strangly enough. So yes, there is one type of warm blooded reptile.

Does a reptile have cold blood?

Reptiles like high steady body temperatures just as mammals and birds do, however, and this means they have sophisticated ways to manage flows of heat between their bodies and the environment. . One common way they do this is to use blood flow within the body to facilitate heat uptake and retard heat loss. A lizard basking in the sun, for example, ramps up its cardiac output. In this way, heat is transferred rapidly from the warm skin, to the body, and the body heats rapidly. Once the lizard has stopped basking, its cardiac output declines, retaining heat within the body so that the body cools slowly. In this way, a lizard can minimize the time it spends soaking up heat, and maximizes the time it can spend doing other essential things, like looking for food and mates or defending territories.

Is a shark cold-blooded or warm blooded?

Most sharks are cold-blooded. Some, like the Mako and the Great white shark, are partially warmblooded (they are endotherms). These sharks can raise their temperature about the temperature of the water; they need to have occasional short bursts of speed in hunting Cold blooded although if you've ever seen a Great White Shark hunt sea lions you'd be thinking they would have to be hotblooded. Actually the Salmon Shark is a warm blooded shark. It needs to be in order to hunt off the cost of Alaska from May to September during the Pacific Salmons spawning season.

Are jellyfish cold blooded or warm blooded?

jellyfish have no blood and exist at the temperature of their surroundings, as do cold blooded organisms

Are all reptiles cold-blooded?

With one or two exceptions, all reptiles are considered to be cold blooded as they use exothermic means, such as sunning on rocks, or shading themselves, to control their body temperature.

Do fish have warm blood or cold blood?

Fish are cold blooded some time warm only if there in cold war and warm water Fish is a reptile and is therefore a cold blooded animal.

How do warm blooded animals keep warm?

Animals need to keep warm, some keep warm by the fur that they have, penguins huddle up they make a circle 1 stands in the middle 2 keep warm then the next 1 goes and they keep going.

Why do reptiles have cold blood?

snakes are cold blooded because they are reptiles and have scales, if they were warm blooded they couldnt have scales and the venom keeps the venom poison..< What the crap? no dude. reptiles have cold blood because their internal organs do not need to be warm to function smoothly, and correctly. unlike mammels that generate our own body heat because we do need warm organs to operate smoothly. Cold-blooded animals, like reptiles, amphibians, and fish, become hotter and colder, depending on the the temperature outside. For example, when the sun sets at night, their bodies are cooler because it is less warm outside. When the sun is out, however, their bodies soak up the heat and become warmer.

What reptiles are cold blooded?

Actually all reptiles are cold blooded. To classify an animal to be a reptile, they need to have scales, and they have to be cold blooded. All snakes, lizards, alligators, skinks, Caiman's, etc. are cold blooded

What organs keep reptiles warm?

Reptiles can't keep warm all by themselves. They are ectothermic which meens they are cold blooded. That meens that they need the sun or somthing elses heat to keep warm. Whatever their surrounding climates temperature is is what the reptiles temperature is. They will lose energy and may die in the cold.

What is the blood temperature of a reptile?

every single animal with scales that are not fish or an amphibian(like a frog or a newt) is cold blooded.

Reptiles are cold blooded true or false?

True - they don't have any way to regulate their own temperature, like mammals do. Instead - they rely on absorbing warmth from a heat source such as the sun (or a heat lamp in captivity).

How do warm blooded animals stay warm blooded?

warmblooded animals keep warm by generating their own heat when they are in a cooler environment.

Who are warm blooded?

Mammals, birds and some fish are warm-blooded. Tuna and some sharks have circulatory mechanisms in their muscles that increase their temperature when swimming at high speeds.

Were dinosaurs the only warm blooded reptiles are were there more?

There were more. In the Permian, Triassic, and early Jurassic periods there were mammal-like reptiles from which true mammals evolved, some of which were likely warm blooded.

Why do reptiles have to bask in the sun to warm themselves?

Because they cannot regulate their own temperature, like mammals (and humans) can. They need warmth to make their muscles work, and to digest their food.

What reptiles are not cold blooded?

this question is one of the most obvious yet unasked question i have ever come across, but there are no reptiles that are "warm blooded", all reptiles must bask or have some source of heat to regulate their blood temperature.

Are protozoans warm blooded or cold blooded?

Protozoans are unicellular microorganisms that do not contain blood. So they are neither warm blooded nor cold blooded.

Are lamprey cold blooded or warm blooded?

Lampreys are considered to be cold blooded as they use exothermic means to control their body temperature. This means that they control their temperature via external means by taking advantage of the environment around them. This would include things like sunning on rocks to warm up, or shading themselves to cool down.

Is there an animal which is cold-blooded and warm- blooded?

no there isn't an animal who is cold blooded and warm blooded they are either cold blooded or warm blooded.

Are Anglerfish warm blooded or cold blooded?

Anglerfish, like most fish, are considered to be cold blooded as they use exothermic means to control their body temperature. This means that they control their temperature via external means by taking advantage of the environment around them. This would include things like moving to warmer water to warm up, or deeper water to cool down.

Why reptiles considered Cold-Blooded animals?

Because they are in need of heat sources, such as the sun, to raise their body temperatures.

Are skunks warm blooded or cold blooded?

Skunks, like all mammals, are considered to be warm blooded as they use endothermic methods to keep their body temperature at a near constant rate. This means that they control their temperature via internal means, such as sweating, shivering and panting.

Are shellfish warm blooded or cold blooded?

cold in water (unless its warm water) and warm blooded in the microwave!! HAHA jk jk jk there cold blooded

What are warm-blooded and cold-blooded?

Warm-blooded means that at rest, the animal keeps its body warm and above the temperature of its surroundings. Cold-blooded means that at rest, the animals body temperature is the same as that of its surroundings. Cold-blooded animals have to warm themselves up (usually by sunning them selves or by vibrating their muscles) before they become active while warmblooded animals are already warm and ready for action. Also warmblooded animals can operate at temperatures where cold-blooded animals can not (eg polar bears). -------------------------------------------------------------- Warm Blooded try to keep the inside of their bodies at a constant temperature. Examples: Birds and Mammals Cold Blooded take on the temperature of their surroundings. Examples: Fish and Reptiles Warm blooded: Requires little or no external heating. Mammals. Cold blooded: Requires external heating. Most others than mammals. . Cold blooded Mollusk are type of invertebrate animals. They are poikilothermic animals i.e. cold blooded. mollusks are cold-blooded because they change the temperature of their bodies in the... . Snakes, lizards, tortoises and frogs and toads and newts, are all cold blooded. Basically most amphibians, all fish, and most reptiles are cold blooded. All mammals are warm blooded. That includes: Whales, Dolphins, elephants, dogs, and humans. Bears are mammals, and all mammals are warm blooded. Sharkes are not mammals, they are fish and therefore, they are cold blooded.

Is a mouse warm blooded or cold blooded?

Mice, like all mammals, are considered to be warm blooded as they use endothermic methods to keep their body temperature at a near constant rate. This means that they control their temperature via internal means, such as sweating, shivering and panting.

How many cold blooded reptiles are in the world?

It is physically impossible to know, or even estimate, the exact number of living reptiles there are in the world, but they are many records regarding the vast types (or number of species) of reptiles that inhabit Earth. Some quick numbers: REPTILES NUMBER OF SPECIMENS Crocodilians over 800 Tuatara about 16 Lizards over 105,000 Amphisbaenians over 450 Snakes over 50,000 Turtles over 18,500

Are humans warm blood or cold blood?

Technically, animals are not "warm blooded" or "cold blooded", but rater endothermic( regulate their own internal temperature) or exothermic (relying on environment to regulate internal temperature) but I don't know how much biology you have taken. Humans are "warm blooded" , as are all animals (or, endothermic - they regulate their own internal temperature).

Are birds and reptiles warm blooded?

Birds are warm-blooded/endothermic. Reptiles are not. They are cold-blooded/ectothermic. Reptiles such as snakes and terrapins must bathe in the sun to get their body temperature to an optimal. Birds can control their body temperature internally.

Are raccoons cold blooded or warm blooded?

They are warm blooded, just like all other mammals. warm blooded reptiles are coldblooded :)

Why did scientists think that reptiles are cold blooded?

They are coldblooded, we say that because they cannot regulate their own body heat. They rely on extern source of heat to stay warm.

Is crocodile cold blooded reptile?

All reptiles are cold blooded. A crocodile is a a reptile thus making it cold blooded.

Why do reptiles need to live in warm waters?

Because reptiles are cold blooded, they're body temperature is the same as what the temperature is outside in their habitat.

How many blood chambers do reptiles have?

smaller reptiles (ground lizards) have 12, but crocodiles and large tortoises have 16. Snakes can vary form 12-16.

How do reptiles warm themselves?

they warm themselves by copying the temperature of the environment in short they are cold-blooded animals

What does cold blooded mean with reptiles?

It means that they don't have thermogenic cells un-like mammals they don't have the abality to keep warm ergo if you put a snake in a freezer it won't die but it will go into hibernation then if you put it in a pot of hot water it will wake from its sleep

Is the blood of reptiles cold?

They cannot internally regulate their body temperature as we can. Their blood may be colder than ours at times, but on a hot day, they may be much warmer than us, too.

Do reptiles like warm climates?

it all depends on what reptile you look at like lizard like a heat lamp while geckos like a rainforest's climate

Why are reptiles referred to as cold-blooded?

Reptiles are cold-blooded because they are incapable of producing their own source of heat. That's why when you see reptiles they are often in a sunny area.

Why do reptiles need to live wherer it is warm?

Because reptiles are ectothermic - which means they are cold blooded and they really on other heat sources to increase their body temperature in order to survive. Reptiles are slow unless they've been basking(lying in the sun) to increase their body temp. They will also struggle to digest their food if they are not at the right temperature and the food can rot inside them.

Why mammalian and aves are warm blooded but amphibian and reptiles are cold blooded?

Evolution did not require amphibians nor reptiles to be warm blooded as they began in the ocean/waters making them "ectothermic" they only existed in waters that was best suited for their body temperature. you would never see an amphibian in the poles nor in extreme cold climates. they tend to exist most anywhere near the equator and the tropics of Cancer and Capricorn, areas that are highly tropical to sub tropical regions. those in sub tropical regions and on the boundaries of the Cancer and Capricorn tend to hibernate underground where it is warmer and come out in spring to enjoy the warmth of the sun, to feed and breed. Since the "Cambrian explosion" and they (reptiles and amphibians) moved onto land still remaining cold blooded they do feel the difference in body temperature due to the climatic changes they encounter ie: on warm days you will see them sunning themselves to get warmth from the sun and hibernating underground where it warmer during the winter season. this lead to the evolution of mammals and aves(which are technically Reptiles) which required them to be warm blooded in order to survive the elements. Mammals and Aves evolved to be warm blood (endothermic) to be better able to battle the climatic elements and also give them a wider range of habitation eg: Polar Bears have warm blood, thick layers of fat and very think waterproof fur to keep them warm and exist in the northern hemisphere in the Arctic Circle where as The Emperor Penguin(an Ave) too is warm blooded, layers of fat covered with very thick downy feathers with a thick layer of outer long waterproof feathers to enable them to endure the unforgiving elements of the Antarctic Circle. Woolly Mammoths during their existence also had evolved to live in unforgiving territories in the Northern Hemisphere eg: Siberia/Alaska with huge layers of fat and very thick woolly fur to keep them warm. this is true for all Mammals and Aves (since late 2011 now officially known only as birds not Aves and listed as Reptiles by Taxonomists and recategorised in the Phylogenic tree. Up until 2011 Birds/Aves lived in their own "CLASS". However due to their prehistoric relations and the discovery of a preserved Ave/Bird in a recent excavation that revealed a Dinosaur with feathers intact they have now been reclassified into the CLASS: Reptilia even though they are warm blooded! their common traits with true Reptiles far outweighed those with mammals and hence were moved officially to the Reptilia CLASS leaving many major UNIVERSITY text books to be updated). where other mammals are concerned in that they belong in the Phylogenic tree under Kingdom: Animalia Phylum: Chordata Class: Mammalia, and in your question "WHY THEY ARE WARM BLOODED" is quite easy, there are many aspects to having warm blood than just location and climate. It comes down to reproduction and birth of new generations. As Mammals give "Vaginal" birth to their young, warm blood is necessary to keep the young warm in the womb and then also is required in the production of breast/mammary gland heat to produce milk to nourish their young. In the case of Marsupial Mammals, they also have a pouch to nurse their young to keep them warm where the teats can be found giving the young a perfect place to nourish and grow safely tucked away and warm till they are ready to leave their mother. Your question is a great question but one that is not simple to answer in just a few lines as it is a very COMPLEX topic and very broad in explanation. i have endeavoured to answer it as broadly as possible. One Mammal i have left out in this answer that does rate a mention of WHY? is Dolphins and Whales, especially Humpback Whales that travel from the Antarctic north to Hawaii every year along the eastern seaboard of Australia to calve in the warm waters of Hawaii, mate, feed and feed enough to reboost their body fat for their trip back with their calf and pregnant once again to the Antarctic where they will remain feeding and nurturing their young calf till it is time for the next season to head north once more for calving. a young Humpback will remain with its mother for approx 2 years before it is big enough and strong enough to do the journey on their own and begin their own generation of Whales. Being warm blooded for them is highly important as they require it for many reasons not just the extremes of temperature that they encounter but for very need of their survival as a species!

Are reptiles cold and warm blooded?

Nearly all reptiles are cold blooded. This means their bodytemperature is determined by how warm or how cold theirsurroundings are. (Thus, it is believed that most reptiles wouldnot do very well in a cold climate, since it would drive down theirbody temperature to dangerous levels.) It should be noted thatscientists believe some ancient dinosaurs, although reptilian, werewarm-blooded. But these days, reptiles are generally classified ascold-blooded. Reptiles are cold blooded. Their temperature is determined by theenvironment.They warm up their blood by standing in the sun. cold blooded. thats why snakes lay on rocks in the sun in thesummer. Reptiles are cold blooded. That's why snakes lie on rocks in thesun in the summer. Reptiles are cold blooded creatures. This does not literally meanthat their blood is necessarily cold, it means that they do notmaintain any specific blood temperature (as mammals do) but thattheir blood will have the same temperature as the environment wherethe reptile is. In warm weather they will have warm blood, and incolder weather, they will have colder blood.

What is a cold-blooded reptile basking on a warm rock in the sun warmed by?

A cold blooded reptile basking on a warm rock is being warmed bythe sun's heat.

Are reptiles cold-blooded or warmblooded?

They are cold-blooded. They need to warm their bodies, by 'basking'in the sun before they can go off in search of food.

Are fish and reptiles both warm blooded?

Yes and no. To be considered warm-blooded, a creature must be able tointernally generate its own body heat and maintain it above orbelow the temperature of its external environment. Some cold-blooded creatures can generate internal body heat, butmost don't. What is common to all cold-blooded animals, whether notthey can generate body heat, is that they cannot maintain atemperature above or below that of their external environment. Reptiles have been determined to be cold blooded until recentlywhen one exception was discovered. The tegu, a lizard, is able toheat its body 10 degrees centigrade above that of its surroundingenvironment. No other known reptile at this time has thatcapability. Fish are cold-blooded with one exception. The exception is the opahfish which is truly warmblooded. It maintains a body temperature of5 degrees centigrade higher than its surrounding water. Both of these discoveries were very recent--the opah in 2015 andthe tegu in 2016.