Scientists are investigating mass die-off of humpback whales.
Humpback whales now gather in groups of 200, which is surprising, considering they are solitary creatures.
A humpback whale has been seen thrice in the same week in the Hudson River.
Researchers explain why the humpback whale ended up in the congested Hudson River.
Humpback whale numbers have been increasing, thanks to the stop of whaling and other precautions.
Young humpback whale washed to shore in California, said to probably be hit by ship.