There is a continuous tussle between predators and their prey. Predator need to be adapted for efficient hunting if they are to catch enough food to survive. Prey species, on the other hand, must be well adapted to escape their predators, if enough of them are to survive for the species to continue.
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Survival strategies enable organisms to cope with particular stresses, from temporary environmental changes in the weather to the constant threat of predation. So, for instance, to avoid the cold of winter animals may migrate away or hibernate, while trees may shed their leaves. To avoid predation, plants may be poisonous or covered with defensive spikes and animals may use camouflage or travel in great numbers.
Learn about predator-prey relationships in the African savannah
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If the prey in an ecosystem grows, predator numbers will respond to the increased food supply by increasing as well. Growing predator numbers will eventually reduce the food supply to the point where it can no longer sustain the predator population ... and so on.