I take it your meant 4 legs no there are not
A frog? Maybe.
The spiny anteater, more correctly known as the echidna, does indeed have four legs. It is a mammal, and all terrestrial mammals have four legs.
Mammals have a 4 legs besides the dolphin do not have a legs.
Yes. Bird lungs are more efficient than mammal lungs.
their legs
It depends on the mammal. Most common is 4 or 2 legs.
Three legs are more stable than 4 legs.
A horse is a mammal because it has mammary glands and nurses its young.
Insects only have six legs and are not mammals.
cows been found with 6 legs but idk about 10 legs...
Because we have four arms/legs and hair.
None. There is no insect with more than 10 legs. If so, it belongs to another creature classification.