Blue whales, the largest animals on Earth, have been sighted along the San Diego coastline, signaling the beginning of the blue whale watching season.

Blue whales, the largest animals on Earth, have been sighted along the San Diego coastline, signaling the beginning of the blue whale watching season.

Changing ocean conditions making whale prey scarce are causing the mammals to stop singing, a recent study has found.

Whale watching charter owners said they couldn’t remember a time over the last decade when blue whales, the earth’s largest mammals, showed up this late off Southern California. In recent ...