Endangered North American right whales gave birth last winter to the fewest calves seen off the U.S. coast in 17 years, troubling scientists who say the low births support other evidence that the imperiled species’ population may be declining.
Endangered North American right whales gave birth last winter to the fewest calves seen off the U.S. coast in 17 years, troubling scientists who say the low births support other evidence that the imperiled species’ population may be declining.