Sydney’s harbor becomes a humpback highway in winter as the whales migrate from feeding grounds in Antarctica to breeding areas off Australia’s coast.

Volunteers are working frantically on a second day to save dozens of pilot whales that have stranded themselves on a beach in Western Australia, but more than 50 have already died.

More pilot whales were found stranded on an Australian coast Wednesday, raising the estimated total to almost 500 in the largest mass stranding ever recorded in the country. (Australian Broadcast Corporation via AP)HOBART – More pilot whales were found stranded in Australia on Wednesday, raising the estimated total to nearly 500, including 380 that have died, in the largest mass stranding ever recorded in the country. Another 200 stranded whales were spotted from a helicopter on Wednesday less than 10 kilometers (6 miles) to the south, Tasmania Parks and Wildlife Service Manager Nic Deka said. Australia's largest mass stranding had previously been 320 pilot whales near the Western Australia state town of Dunsborough in 1996. In neighboring New Zealand, more than 600 pilot whales washed up on the South Island at Farewell Spit in 2017, with more than 350 dying.