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.
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, a branch of vertebrates, possess hair and mammary glands. No other vertebrates do.
mammals have hair all over their bodies, they give birth to live young, they include the largest animal ever-the blue whale
Vertebrates have backbones, other animals (besides vertebrates) don't have back bones.
Elks are vertebrates. An invertebrate has no backbone like a snail.
they are warm blooded
The most body covering of a bird is the beak.
Hair and milk.
Yes. All mammals, including marsupials, have the following characteristics:a body covering of fur, skin or hairsuckle the young on mothers' milkwarm-blooded vertebrates which breathe through lungswith the exception of platypuses and echidnas which are monotremes, or egg laying mammals, all other mammals including marsupials give birth to live young
Bird and mammals are the only two groups of vertebrates which are warm blooded. Amphibians, reptiles and fish, the other vertebrate groups, are all cold-blooded.
There are many such features, including: 1. Mammals nourish their young with milk. 2. Mammals are warm-blooded. 3. Mammals have fur. 4. Mammals have a four-chambered heart. 5. Mammals are amniotes. 6. Mammals breathe oxygen. 7. Mammals have three middle ear bones and a neocortex. 8. Mammals have internal reproduction. Some of these characteristics are unique to mammals; others are found in some other vertebrates but not in all other vertebrates.
hair