Female bison are being rounded up on Santa Catalina Island for injection of contraceptives, the latest attempt to keep bison populations on the island from getting out of control. 
The corraling began Thursday, and scientists with the Catalina Island Conservancy hope to reduce the island’s herd — 350 in 2003, when they were found to be undernourished and in poor health — to 150 or 200.
Females over 2 years old will receive the injections in a five-year experiment.
The alternative, shipping the animals to Indian reservations, is costly and hard on the bison, the conservancy says.
The bison aren’t native to the island, but descend from animals brought over in 1924 for a movie. They never appeared in the film, but have become permanent fixtures on the island.
(2002 photo of bison on Catalina by the Associated Press.)
Read the Associated Press story.
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