¿Qué es un mamífero?

The video explains what mammals are, highlighting their characteristics such as being vertebrates with backbones, having fur or hair, being warm-blooded, and their reproductive process involving live birth and feeding young with milk from mammary glands. Examples include humans, whales, and moose.

How does being warm-blooded benefit mammals in different environments?

Discuss the differences in reproduction between mammals and other animal groups like birds and fish.