Mammals of Pennsylvania Online Resource

What is a mammal?

A mammal is a hairy, milk-producing endotherm. The following is a brief description of mammalian characteristics:

 

  • Mammals have hair or fur  
  • Mammal mothers nurse their young
  • Mammals are “warm blooded”
  • Mammals have four-chambered hearts
  • Nearly all mammals bear live young (all Pennsylvania mammals do)
  •  

    Click to return to Mammals of Pennsylvania home