And they do not have hair, they have feathers. Most mammals also have hair to help keep them warm. Mammals,however, did not have this hole in the skull at any time in their evolution, and no mammal has four-color vision (even primates like us have only three), so by this new definition, mammals are NOT descended from reptiles. Reptiles are cold-blooded - birds are not related to reptiles. They do not produce milk to feed their young. Birds are warm blooded, but that alone is not enough to make them mammals. A number of distinct characteristics can be found in birds, beyond having feathers. Birds are warm blooded, but that alone is not enough to make them mammals. Are Birds Mammals – What Are Birds And Difference Between Birds And Mammals. All living things have a biological classification, and they are in order from broadest to narrowest: Kingdom, Phylum (division), Class, Order, Family, Genus, Species. So how do we describe a mammal?? They would need to have hair or fur and nurse their young. Would you like to merge this question into it? There are several types of feathers, each serving its … Birds are not mammals they are aves. One typically learns in school that a bird is a bipedal, warm-blooded animal, a vertebrate, covered in feathers and lays eggs. By this definition, birds have all of the attributes that would make them reptiles, despite that they are warm-blooded. Well, of course you know the answer to this question. The only group of mammals that can truly fly under their own power are bats, but again, they are not birds. Now comparing the blood, birds have a nucleus in the RBS whereas it is not generally seen in mammals. Mammals are warm-blooded. Mammals and birds are two completely separate classes of animal. Birds are Oviparous animals. You are correct that mammals are named that because they nurse their young from mammary glands. All mammals, even the oddballs like monotremes, nurse their young. For over a hundred million years, mammals were small and not very diverse, but with the extinction of dinosaurs in the Cretaceous-Tertiary extinction 65 million years ago, they grew in size and diversified. They do not bear live young, they lay eggs. Birds are in the class Aves.Reptiles (crocodiles, turtles, snakes, lizards), are in the class. One of the more obvious characteristics that differentiates birds from mammals is that birds lay eggs and mammals give live births. Some reptiles and amphibians too can glide (although strictly, this isn’t flying). Some reptiles and amphibians too can glide (although strictly, this isn’t flying). Feathers are a feature characteristic of birds (though also present in some dinosaurs not currently considered to be true birds).

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