DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Frog spawn. Frog eggs will usually develop and hatch into tadpoles with a week. Many species of frog lay their eggs together. This is to overwhelm the number of predators, for whom the eggs are easy prey. Due to sheer numbers, some eggs will survive to become tadpoles and on into adulthood, although the majority will die from predation.
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