In the spring, the female frog lays thousands of eggs which the male frog fertilizes when they are laid.  Early - breeding frogs lay their eggs deep in the water. Late-breeders lay their eggs on the surface of the water.  The eggs become tadpoles fron four to fifteen days depending on what the temperature is.  The gill-breathing tadpoles eat decaying animals and water plants.  Slowly, hind legs, lungs, and front legs appear but the tail disappears.  Most tadpoles become frogs in one season, but the American bullfrog takes two years to transform.  Frogs pull  their skin over their head.

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Drawing by Zack Johnson