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A '''Bird''' is a warm-blooded [[egg]]-laying [[vertebrate]] with [[wing]]s and [[feather]]s.  For the most part, they fly.

A '''Bird''' is a cold-blooded [[egg]]-laying [[vertebrate]] with [[wing]]s and [[feather]]s.  For the most part, they fly.

[[Ostrich]]es, [[penguin]]s, and [[emu]]s are birds that don't fly, although penguins have sometimes been said to "fly" underwater. [[Robin]]s, [[sparrow]]s, and [[eagle]]s are more typical flying birds.

[[Ostrich]]es, [[penguin]]s, and [[emu]]s are birds that don't fly, although penguins have sometimes been said to "fly" underwater. [[Robin]]s, [[sparrow]]s, and [[eagle]]s are more typical flying birds.