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Animals that lay lots of eggs do not look after the eggs or young once they are laid.
This means that vast number are subject to predation and only a few will survive to form the next generation. They also frequently all lay eggs together to minimize the chances that their eggs are the ones that all get eaten.
Animals that produce fewer offspring at any one time usually tend their young to ensure that they survive to adulthood.

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Q: Why do animals lay thousand of egg?
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