This past winter has conservationists trying to save the North Atlantic right whale worried.

Their winter breeding season is currently ending, and no new calves have been seen. Births tend to peak in waters off the coast of Florida and Georgia in January and February. Experts say it's still possible that one or two may have been born but out of view of coastal monitors.

"I think everyone remains hopeful that whales will turn up on the feeding grounds with babies still," says Tonya Wimmer from the Marine Animal Response Society. "In some years... a few animals have turned up with a baby that wasn't observed on the breeding grounds. Usually most moms are observed there... maybe something was different