Zoological parks are becoming important conservation organizations. They contain a large resource base in both staff training and fund raising. Thousands of staff members employed by zoos participate in numerous in situ and ex situ conservation projects worldwide. Some of these projects have resulted in saving wild populations of mammals from certain extinction. Good examples of this are the golden lion tamarin (Leontopithecus rosalia) and Arabian oryx (Oryx leucoryx) programs. Both wild populations lacked enough animals for long term survival. A consortium of zoos working together moved and released captive born animals back into their historical ranges in hopes of re-establishing wild populations. Both of these re-introductions have succeeded and these now wild populations continue to reproduce and their numbers are increasing.

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