Environmental biologists are attempting to reduce the herd-size of bison in Catalinas pastoral zones. Herd-size tends to increase by about 15% during mating season. Too-large herds damage the environment, over-graze, and make the bison population less healthy. A smaller population means better food and health for the herd as a whole. Biologist use chemical innoculations in order to reduce the number of calves born to female bison.
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