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Amphibians	Birds	Mammals	Reptiles

Like birds, reptiles, mammals, and fishes, amphibians are vertebrates that is, creatures with a backbone and an internal skeleton. Amphibians live part of their life in waterand part on land. Even those species that lay eggs on land start life in a fluid-filled egg, breathing through gills. (as defined from Yahooligans.com)

Birds are warm-blooded creatures, like mammals, but they lay eggs, like most reptiles. All birds have feathers and wings, and most birds are able to fly. Birds are amazingly varied in their shapes, sizes, colors, and behavior patterns. There are more than 9,000 different species of birds in the world.
(as defined by Yahooligans.com)

Penguins

What Is a Mammal?

Mammals live on land, at sea, in the air, and under the ground. All mammals, from bats to whales, share a number of important traits that make them different from other animals. Mammals are warm-blooded, they have fur or hair, and most mammals give birth to live young (rather than laying eggs).

(as defined by Yahooligans.com)

What Is a Reptile?
                        Today there are 6,800 reptile species on earth; the major
                              groups are alligators and crocodiles, turtles, lizards, and
                              snakes. All reptiles are cold-blooded, which is why they
                              warm themselves in the sun, and have bodies covered in
                              dry, horny scales. Some reptiles lay eggs; others give birth
                              to live young.

What is a Reptile?(and what isn't!)
What is a Reptile?(from Ohio kids)
What is a Reptile?(Yahooligans Animal Site; lots of links to reptiles.)