Frogs and Natural Selection
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Frogs in a swamp have different lengths of legs. (Long-legged frogs are represented by green, short-legged frogs are represented by brown.) Leaf the frog is green and has long legs.
After 5 years
Eventually, Leaf mates with a frog lady who has long legs just like his. His babies also have similar leg lengths
After 10 years
Leaf's friends, who have short legs, are not as fast as him and his children. They get eaten more often by predators than frogs like Leaf who are long-legged.
After 15 years
5 years after Leaf mates, he watches his offspring and other frogs like him that have long legs survive more often.
10 years later, Leaf's children see even more long-legged frogs survive. There are more long-legged frogs to mate with, so they continue to increase in frequency.
After 15 years, Leaf's grandchildren see that nearly all of the short-legged frogs are disappearing. The elderly Leaf tells them about how he was able to survive because of his long legs.
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