There's a Koala baby boom on one Australian island and scientists are hoping to slow that down. Scientists are hoping a new contraceptive dart will slow down the population explosion of koalas on Kangaroo Island.

The island's eucalyptus trees are dwindling and the island's 28,000 koalas are eating themselves out of a habitat. The animals eat nearly a pound of leaves every day. So far, the contraceptive darts have proved 100 percent successful.

The dart is expected to block reproduction for two years through a slow release of a hormone. It carries a device that's inserted under the skin without sedation.

Scientists say so far the hardest part has been coaxing the koalas out of the trees to have the device implanted. Koalas spend most of their days sleeping up to 100 feet above ground in trees. Scientists say they're working on a new system of injecting the animals.