A reclusive deep water whale has washed up on a US beach, giving marine biologists a rare chance to investigate the species.

The 17ft carcass, weighing almost a tonne, is believed to be a female Sowerby's beaked whale, which typically range in waters up to 5,000ft deep.

Holidaymakers at Jones Beach, in Plymouth, Massachusetts, were amazed to see the whale, which has a distinctive beak, similar to a bottlenose dolphin.

Bathers crowded around the 17ft carcass, which was said to be in a good condition (Facebook/Mary Kate McHugh DiLoreto)

Mary Kate McHugh DiLoreto, who discovered the whale while out walking on Friday, posted on Facebook: “We were amazed to learn that one of the rarest species washed ashore.

“It is a beaked whale not commonly found in this area.

“We were told members of the aquarium were heading down to bring it back to study it. Very cool!”

New England Aquarium biologists and staff from the International Fund for Animal Welfare are performing a post-mortem at the Woods Hole Oceanographic Institution, the Press Association reported.

It is the first Sowerby's beaked whale the aquarium has handled for almost a decade.

CBS Boston reported that the whale's carcass was in fairly good condition when it was discovered.

Sowerby's beaked whales usually swim in depths of up to 5,000ft and dive for up to 30 minutes (Wikipedia)

First described by English naturalist James Sowerby in 1804, Sowerby's beaked whales are reclusive creatures that stay away from ships and are rarely sighted. Commercial fishermen sometimes net them accidentally.

They are believed to feed primarily on squid and molluscs, but cod has also been found in their stomachs.