The rapid expansion, over-exploitation and subsequent decline in whale stocks in the northern hemisphere in the 20th century ...

Stunning new footage captures the moment adult orcas carefully teach their calves how to hunt, demonstrating how to push a seal off a bit of ice before getting the young to give it a go themselves.

ABC News' James Longman reports on scientists' conservation efforts. Antarctica -- Eight layers. Thermals, more thermals, inner layers, outer layers, and waterproofs. I do not do well in the cold. Now ...