(CNN) – As we hit day 79 of the BP oil disaster, a new report from National Geographic is raising more red flags about the impact the oil is having on threatened and endangered birds. Experts say cleanup crews working in sensitive areas are causing adult birds to abandon their young, and chicks and eggs are accidentally being trampled on. So far, the feds say more than 2,300 birds have been collected, but about 60% of them were already dead. Our John Zarrella reports on the crews working feverishly to save the ones found alive. Watch 