Vertebrates are animals with backbones and include five main groups: amphibians, birds, fish, mammals, and reptiles. Amphibians have moist skin and breathe with lungs and gills, birds are warm-blooded and have feathers and wings, fish breathe with gills and have fins, mammals are warm-blooded and produce milk for young, and reptiles have dry scaly skin and lay eggs.

1. Vertebrates
(with backbone)
Amphibian Bird Fish Mammal Reptile
• cold-blooded • warm-blooded • cold-blooded • warm-blooded • cold-blooded
• breathe with • lay eggs • breathe with • have hair • breathe with
lungs and gills • have feathers gills • produce milk lungs
• smooth, moist & wings • lay eggs for young • lay eggs
skin (no scales) • two legs • have fins • give live birth • dry scaly skin
• lay eggs • breathe with • have hair or fur
lungs • breathe with
• have bills or lungs
beaks
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