Grisly scenes on a Tasmanian beach have hiked the pressure on investigators to explain a spate of penguin massacres that have left wildlife advocates both stunned and angry.

In the third mass killing of little penguins in six months, around 30 of the birds were found dead on remote Waubs Beach near Bicheno on the state’s east coast.

Autopsies will be conducted to determine how they died.

In October, 58 little penguins were killed in a suspected dog attack at Low Head in the state’s north.

It prompted calls from conservationists for greater wildlife protections and dog controls.

An earlier massacre, also at Low Head, came to light when a stroller found the bodies of a dozen little penguins stuffed in a rubbish bin.

The state’s Department of Primary Industries, Parks, Water and Environment wants anyone with information about the latest find to come forward.

Little penguins, also known as fairy penguins, on average weigh one kilogram and grow to 40 centimetres.

-with AAP