Definitions

1. noun

A warm-blooded animal that has hair or fur and whose females produce milk to feed their young

“The zoo is home to a variety of mammals, including elephants, lions, and monkeys.”

2. noun

A member of the class Mammalia, characterized by the presence of mammary glands, hair, and three middle ear bones

“Biologists spent years studying the genetic makeup of various mammals to better understand their evolution.”