They mean the same thing it is just that mammals is the plural form of mammal.
No, mammals is a plural form for the noun mammal, a thing. There is no verb form for the word mammal or mammals.
"Mammal" comes from mammary gland. All animals that produce milk are mammals.
The word mammal is rooted in the Latin word mamma, mammae which means "breast". This is appropriate since one of the characteristics of mammals is that they nurse their young.
Afrikaans for "mammal" is "soogdier". In English that translates as "suckling animal". Mammals suckle their young.
Mammals
Caribou and lemming are arctic mammals that have seven letters.
Seals are mammals
Anteaters are mammals.
It is a mammal
No, a Horse is a mammal.
A monkey is a mammal.
An octopus is classified as a "mollusc", not a mammal.