It is more difficult for warm-blooded animals to loose warmth than to stay warm.Humans, which are warm-blooded, maintain a constant temperature of around 37° Celsius.

If a frog is too hot, it may retreat to water.

Defining Endothermic Animals.

There are also many small birds, and mammals that are known to hibernate even though they are warm-blooded, such as the California mouse and the kangaroo mouse.

Most mammals, small and big, as well as many birds, are warm-blooded animals.

Login The characteristic speed of locomotion of animal is not an indication of whether it is ectothermic or endothermic.

All the above b. Dolphins do not lay eggs.

Warm-blooded animals are also called endothermic or homoeothermic animals, and they generate heat internally and have a thermoregulatory system that maintains a constant body temperature largely independent of their surroundings.

Most sharks, like most fishes, are cold blooded, or ectothermic.

We could not find a follow-up to the 2009 study The evidence is indirect.

That may seem more difficult to believe if you have ever noticed how certain small lizards are rather slow on cold morning as they sit out in the sunshine trying to warm up. History at your fingertips Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox.

5.

Instead they need to warm up using other things outside their bodies- this action is called thermoregulation.

Only a small amount of food they eat is converted to body mass.

Therefore all primates (such as humans, apes, and monkeys), cats (tigers, cheetahs, and domestic cats), rodents (rats, beavers, and chipmunks), marsupials (kangaroo), weasels (badgers and meerkats), monotremes (platypuses), sea mammals (whales, seals, walruses, manatees, and dolphins), dogs, pigs, and elephants are warm-blooded.

Ectotherms use behavioural mechanisms to control their body temperatures.

Categories  They have various strategies to preserve warmth, including a thick fur which they may grow in winter and shed in summer, or the feathers of a bird, or the blubber in sea mammals.

Answer to: Which characteristic below makes the dolphin a mammal? Moreover, some other mammals, such as bats, mole rats, and echidnas, are neither warm-blooded or cold-blooded.Since they are not dependent on the surrounding environment to maintain their body temperatures, warm-blooded animals can live in both warm and cold places.

In order for a turtle to eat properly and be active they require warmth.

The air, water, or ground around them determines how hot or cold they are. c. Dolphins are ectothermic.

Though the warm-blooded animals have to consume a lot of food to remain active, they have the energy and means to colonize all kinds of environments, even in cold Antarctica or in higher mountain ranges. Ectotherm, any animal whose regulation of body temperature depends on external sources, such as sunlight or a heated rock surface.

In contrast, similar adaptations can help cool endotherms when needed, such as dolphin flukes and elephant ears.

They can also move longer distances and are faster than cold-blooded animals.Since the body temperatures of warm-blooded animals remain stable, they provide suitable living conditions for many parasites, such as worms, or micro-organisms including bacteria and viruses, many of which can cause fatal diseases. Panting is another mechanism to lose heat.Warm-blooded animals generally do not have to hibernate besides a few exceptions, and they can be active throughout the year, feeding, moving, and protecting themselves from predators.

There are also various behavioral responses including shivering, migration, or hibernation in cold temperatures. What classifies dolphins as mammals are that they give birth to live young, have body hair, and feed their young with milk produced by their bodies.

Frogs are ectothermic amphibians who are unable to regulate their temperatures internally like birds or mammals. There are however 5 species of sharks that have some warm blooded, or endothermic capabilities.

Endothermy is a feature that appeared late in the evolution of animals, and is found only in modern animals.

Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Endothermy is a feature that appeared late in the evolution of animals, and is found only in modern animals.

Sweat glands are used to lose heat; in primates and humans these are present all over the body, while in cats and dogs the glands are found only on the feet.

Iguana in Galapagos National Park, Galapagos Islands, Ecuador.This article was most recently revised and updated by

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