One of the most important modern functions of zoos is supporting international breeding programmers, particularly for endangered species. In the wild, some of the rarest species have difficulty in finding mates and breeding, and they might also be threatened by poachers, loss of their habitat and predators. A good zoo will enable these species to live and breed in a secure environment. In addition, as numbers of some wild species drop, there is an increased danger of populations becoming too genetically similar. Breeding programmers provide a safeguard: zoo-bred animals can be released into the wild to increase genetic diversity.
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