Pilot whale
Nearly 500 whales beached two years ago in the same Tasmania harbor in the largest mass-stranding in Australia’s history. Rescue efforts resumed Thursday.
It's the largest mass stranding ever recorded in the country.
Officials from New Zealand's Department of Conservation made the "heartbreaking decision" to euthanize the whales.
Rescuers unsuccessfully tried to nurse the male pilot whale back to health.
WHAT'S HAPPENING
Research has shown that some marine mammals do mourn their dead.