Ancient giant penguin unearthed in Peru
Scientists say the find shows that key features of the plumage were present quite early on in penguin evolution.
The team writes in Science journal that the penguin's feathers were brown and grey, distinct from the black "tuxedo" look of modern penguins.
It was about 1,5m tall and nearly twice as heavy as an Emperor Penguin, the largest living species.
The bird, named Inkayacu paracasensis, or Water King, waddled the Earth during the late Eocene period.
It had a long, straight beak, much longer than that of its modern relatives.
The fossil was found in Reserva Nacional de Paracas in Peru. The scientists nicknamed the penguin "Pedro" - after a scaly character in a Colombian TV series.
One of the highlights of the study was the presence of well-preserved feathers and scales.
"Before this fossil, we had no evidence about the feathers, colours and flipper shapes of ancient penguins," said Julia Clarke, a palaeontologist at the University of Texas, US, and lead author of the study.
"We had questions and this was our first chance to start answering them."
She explained to BBC News that the fossil also shows that penguins' main physical features evolved millions of years ago, but the colour of penguin feathers switched from reddish brown and grey to black-and-white quite recently.
See www.bbc.co.uk for full version.