Does Evolution Progress at a Snail's Pace, or can it Leap Forward Rapidly?

A new study that documented rapid changes in the physiology of snail kites in the Florida Everglades has prompted researchers to question exactly how fast evolution can occur in a longer-lived animal – in this case: instead of occurring over a long period of time, over numerous successive generations; the changes in these birds, prompted by the introduction of a new species of prey available to them, took place in less than one-and-a-half generations.

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