mammals have hair all over their bodies, they give birth to live young, they include the largest animal ever-the blue whale
The most obvious way in which mammals differ from the other four classes of vertebrates is that mammals nurture their young on mothers' milk.
Mammals are the only ones that can have fur or hair over their skin. Birds have feathers. Amphibians have moist skin. Reptiles have scaly skin. Fish have scales.
Vertebrates have spinal chord and invertebrates don't.
Vertebrates have backbones, other animals (besides vertebrates) don't have back bones.
Mammals differ from birds as birds lay eggs, and mammals give live birth.
Snakes eyes differ from eyes of mammals or other vertebrates. Other vertebrates are able to focus a sharp image on he retina of their eyes, by using a special muscle to change the shape of the lens. In many snakes though these muscles are absent, therefore a snake cannot focus on a stationary object. They are however very sensitive to movement. Some snakes have excellent eye sight but they are very uncommon.
Adaptations that birds and mammals share include the fact that they are both warm blooded, they are both vertebrates, and they both have four chambered hearts. Unlike mammals, birds are covered in feathers and all birds lay eggs. Unlike birds, mammals are covered in hair, produce milk for their young, and nearly all mammals give birth to live young (except a few species that lay eggs).
vertebrates differ from other animals because they have a central nervous system running down their back
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Yes, reptiles are NOT mammals. Reptiles are exothermic vertebrates (coldblooded), have no fur, lay eggs and do not lactate. Mammals are endothermic vertebrates (warmblooded), have fur/hair, give birth to live young and lactate.
There are 6 species of porpoise. Naturally the vertebrates differ. The most recorded is that of the finless porpoise, with only 58 to 65 vertebrates.
Only mammalian kidneys have a renal pelvis (dilated beginning of the ureter) and renal pyramids (8 to 18 cone-shaped tissues in the renal medulla). The renal medulla (the innermost part of the kidney), and the renal cortex (surrounds the renal medulla) are more distinguishable in mammals than in other vertebrates.