Scientists have discovered the remains of a giant penguin the size of a human.
An amateur palaeontologist unearthed leg bones of the new species at a site in New Zealand.
Researchers believe the bird, which lived between 66 and 56 million years ago, would have stood 1.6m (5ft 3in) tall.
Today’s largest species, the Emperor Penguin, grows to around 1.2m.
Museum curator Paul Scofield said the “monster penguin” evolved after large marine reptiles disappeared from the oceans.
He explained: “For 30 million years, it was the time of the giant penguins.
“We think that at the time, animals were evolving very rapidly.
“Water temperatures around New Zealand were ideal back then, around 25C (77F) compared to the 8C we have now.
“This is one of the largest penguin species ever found.”
The new bones were discovered at a site in North Canterbury, New Zealand, last year.
The location, where a riverbed cuts into a cliff, has been the scene of many important fossil finds since the 80s.
The bones have now been analysed by an international team of palaeontologists.
They believe the penguin weighed up to 80kg (176lb) and lived in the Paleocene Epoch.
At this time New Zealand was still joined with Australia, which in turn is thought to have been connected to Antarctica.
The penguin, latin name crossvallia waiparensis, was specific to the waters of the southern hemisphere.
It closely resembles another prehistoric giant penguin, crossvallia unienwillia, which was found at a site in Antarctica.
Researchers believe the bird’s feet probably played a bigger role in swimming than those of modern penguins.
It would have competed for food with “giant turtles, corals and strange-looking sharks”, according to Mr Scofield.
Gerald Mayr, another author of the new study, believes the monster penguin died out due to growing competition from other marine mammals.
He told the BBC: “At the time giant penguins evolved, the large marine reptiles just had become extinct.
“In Antarctica and New Zealand, there were no large marine competitors until the arrival of toothed whales and pinnipeds (seals) many million years later.”