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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 warm-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, [[cardinal]]s, and [[eagle]]s are more typical flying birds.

Some evolutionists believe that birds have evolved from [[dinosaur]]s, although this view is disputed by both [[creationism|creationists]] and some evolutionists.

Some evolutionists believe that birds have evolved from [[dinosaur]]s, although this view is disputed by both [[creationism|creationists]] and some [[evolution|evolutionists]].

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'''Cursorial Theory'''

'''Cursorial Theory'''

Proposed in 1879 by fossil expert [[Samuel Williston]], the Cursorial Theory suggests that the ancestors of birds were ground-dwelling theropods that developed flight through leaping and jumping. Cursorial Theory is no longer popular among scientists, who generally favor the Arboreal "trees down" theory of flight, since taking off from the ground is energetically expensive, thus it is therefore considered unlikely that flapping flight evolved from the ground up.

Proposed in 1879 by [[fossil]] expert [[Samuel Williston]], the Cursorial Theory suggests that the ancestors of birds were ground-dwelling theropods that developed flight through leaping and jumping. Cursorial Theory is no longer popular among scientists, who generally favor the Arboreal "trees down" theory of flight, since taking off from the ground is energetically expensive, thus it is therefore considered unlikely that flapping flight evolved from the ground up.

However, proponents of the Cursorial theory point to the basilisk lizard, which possesses the ability to run on water for a short time to escape predators, yet also has the ability to climb with great agility. The ability to run bipedally is not evident from the basilisk anatomy alone, and this illustrates the plasticity of animal behavior. It is nearly impossible to determine an animal's behavior simply by looking at its anatomy, as animals are capable of behavior beyond what their anatomy would suggest.

However, proponents of the Cursorial theory point to the basilisk lizard, which possesses the ability to run on water for a short time to escape predators, yet also has the ability to climb with great agility. The ability to run bipedally is not evident from the basilisk anatomy alone, and this illustrates the plasticity of animal behavior. It is nearly impossible to determine an animal's behavior simply by looking at its anatomy, as animals are capable of behavior beyond what their anatomy would suggest.