That is simple.. Dolphins, Chimpanzees and Humans, are different from most mammals because they have similar bones in there body. Why don't you look their systems in their bodies to compare.
Mammals can give birth,where few animals cant
All mammals including woolly mammals are different from other vertebrates in possession of hair ,wool is also type of hair .
Mammals are different than other animals for a few reasons, but the main one is the presence of hair or fur. Another reason is that mammals have mammary glands.
Mammals have several different external features that make them different from other animals. Some of these features include body hair or fur, external mammary glands, and warm-bloodedness.
The presence of a backbone (a "vertebrae") does not DEFINE a mammal because other animals also have backbones, eg reptiles, birds and fish - these animals are also "vertebrates".Mammals are mammals because they are the only animals to have fur/hair and feed their young on milk.
mammals eat other species and other animals
they are called animals because they are all different. on the other hand there is a group which animals are divided by these are: reptiles mammals amphibians birds & fish
No body temperature is kept constant regardless of the weather by Homeostasis, which is a inbuilt mechanism in the bodies of mammals and some other animals.
Everything but bugs
Seals are mammals because they breathe air, bear live young, and are red (warm) blooded.
Yes, mammals are the only animals with hair, or at least, the only ones with the kind of hair that you are thinking of. Mammals have a particular kind of hair, which is made out of a protein called keratin. There are other animals who have other kinds of hair. Insects have their own kind of hairs, which are sensory rather than protective in nature, and they are made of a different protein known as chitin.