The dolphins or false killer whales were found on an isolated beach in northwest Tasmania. About 136 are alive, but authorities say it will be a challenge to refloat them.

Dozens of dolphins have died after a pod of more than 150 stranded on a remote beach in Australia's southern island of Tasmania, environment officials said Wednesday.A pod of 157 dolphins from a poorly understood deep-sea species was believed to have stranded in the past 48 hours -- with "approximately 90" still alive as of Wednesday morning.

After 157 false killer whales were stranded on a Tasmanian beach, experts said only 90 have survived. Following a few failed "refloating" attempts to return the whales to the sea, the remaining survivors are expected to be euthanized.