Whale-flesh-eating sea gulls. The attacks are causing the whales to change their natural behavior, making them increasingly hesitant to surface. They used to leap out of the water in dramatic displays; now, they simply skim the surface just quickly enough to catch a breath and retreat back to deeper waters. "It really worries us because the damage they're doing to the whales is multiplying, especially to infant whales that are born in these waters," says Marcelo Bertellotti of the National Patagonia Center , a government-sponsored conservation group. Experts also fear that the birds could affect the local tourism industry, changing whale-watching from "a magical experience to something from a horror movie," says Australia's Sky News .