�y��vlog

Members of this subpopulation were only sighted in open water and mainly preyed on California sea lions, grey whale calves and northern elephant seals.

A grey whale, dubbed "Wally" by the marine biologists tracking it, is lost in the Mediterranean - and it must find its way home soon if it is to survive.

A curious young grey whale approaches a pair of hands reaching down from a tourist boat in San Ignacio Lagoon, Mexico.

Humpback whales, however, migrate north from Mexico in the summer, and scientists say Allie’s case is likely unrelated to the grey whale deaths.

The Marine Mammal Center plans a necropsy to determine what killed the grey whale.