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Because being warm blooded, they need food to keep themselves warm.
Wiki User
∙ 7y ago
Anonymous
to feed their young
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Why do mammals lose more heat energy than reptiles?
mammals tend to have heat in their bodies more than their surroundings
Are dinosaurs the oldest mammals?
No. Dinosaurs were not mammals. They were more closely related to birds and modern reptiles than they were to mammals.
Did mammals evolve from dinosaurs?
No. Mammals evolved from synapsid reptiles, a group not closely related to dinosaurs. Dinosaurs are more closely related to modern reptiles and birds than they are to mammals.
Are mammals more popular than non mammals?
No, I don't know exact numbers but mammals are outnumbered greatly by fish, reptiles & insects
Why must mammals take in and digest a greater amount of food than reptiles or amphibians do?
Because - Mammals are warmblooded and more active - they turn much of the food they eat into heat for their muscles, so they are able to move quickly. Reptiles and amphibians are cold-blooded, and are relatively inactive - they get what little heat they need from their surroundings.
How do paleontologists distinguish between fossils of mammals and reptiles?
There are a variety of features but one is the number of fenestrae in the skull. Mammals also have more differentiated teeth than reptiles. Furthermore, you can look at the gait. Mammals have a parasagittal stance, while most reptiles have a sprawled stance.
Why aren't dinosaurs mammals?
Dinosaurs and mammals evolved from two separate branches of reptiles. Mammals evolved from synapisid reptiles (all of which are not extinct) while dinosaurs along with the modern branches of reptiles evolved from sauropsids. So dinosaurs are more closely related to modern reptiles than they are to mammals. In more recent years scientist tend to agree that birds are in fact a surviving branch of dinosaurs.
Why do mammals need more oxygen than reptiles?
Mammals maintain a higher body temperature. In order to do so, they require more energy and that requires more oxygen.
What is bigger mammal or reptile?
There are individual mammals that are bigger than individual reptiles, and there are individual reptiles that are bigger that individual mammals. However, the average size of all extant mammals is larger than the average size of all extant reptiles. Most reptiles are lizards and snakes, which are usually small. Only a few species of tortises, alligators, crocodiles, caimans, and very large snakes are big. Most mammals are bats, rodents, and shrews, which are usually small, but there are still hundreds of mammals that are big, including the biggest animal on the planet: the blue whale. There are more large mammals than there are large reptiles.
Are mammals related to birds?
Mammals are distantly related to birds. Oddly, if you look at an evolutionary tree, birds are actually more closely related to reptiles than they are to mammals.
Why do mammals need to eat all the time?
Apart from moving about, replacing worn-out cells and such, mammals are warm-blooded, and need to spend a fair bit of effort on keeping their body temperature up. This in particular makes mammals need more food than reptiles for instance.
Is an egret a mammal or a reptile?
Birds are neither mammals, nor reptiles. They are an entirely different branch of evolution. However, they are more closesly related to reptiles, which they descended from. Their evolution from reptiles caused them to resemble mammals.
