They have mammary glands and suckle their young.
See the Related Link.
Only humans, which are considered mammals get married.
do all mammals not mate weirdly? humans are the only mammals to look at each other during mateing
A rat has three vena cavas while most other mammals like humans only have two.
Humans and armadillos are they only mammals known to be affected by leprosy.
No. Like most modern mammals, humans are placental mammals. The only living monotremes are the platypus and the echidna.
cats also can distinguish there color
No, humans are mammals...
No. Humans are the only mammals with menstrual cycles. Deer, as well as other mammals, have estrous cycles. http://en.wikipedia.org/wiki/Estrous_cycle
The only other group of mammals that can distinguish colors would be the prime apes and African monkeys. Studies of the cones in the eyes of other animals can prove they see color but not how the interpret the color.
The only native mammal is the Hoary bat. All other mammal species have been brought there by humans.
Frogs do not. Only mammals
No, The only mammals that have chins are Humans and Elephants.