Figure 8.13 Hatching early in response to predators. As the cat-eyed snake begins to attack the eggs of the red-eyed treefrog, the embryos are stimulated to hatch early. Note the tadpole escaping the snake’s attempt to eat the egg in which the tadpole lived. This photo was taken at the Corcovado National Park in Costa Rica.

Photo by Karen M. Warkentin.