Fossilized Giant Penguin Reveals Unusual Colors, Sheds Light on Bird Evolution

Sept. 30, 2010

AUSTIN, Texas — Paleontologists have unearthed the first extinct penguin with preserved evidence of scales and feathers. The 36-million-year-old fossil from Peru shows the new giant penguin's feathers were reddish brown and grey, distinct from the black tuxedoed look of living penguins.

Giant Penguin, Inkayacu
Artist's reconstruction of Inkayacu, or Water King, a giant fossil penguin discovered in Peru. Illustration by Katie Browne.

The new species, Inkayacu paracasensis, or Water King, was nearly five feet tall or about twice the size of an Emperor penguin, the largest living penguin today.

"Before this fossil, we had no evidence about the feathers, colors and flipper shapes of ancient penguins. We had questions and this was our first chance to start answering them," said Julia Clarke, paleontologist at The University of Texas at Austin's Jackson School of Geosciences and lead author of a paper on the discovery in the Sept. 30 online edition of the journal Science.

The fossil shows the flipper and feather shapes that make penguins such powerful swimmers evolved early, while the color patterning of living penguins is likely a much more recent innovation.

Like living penguins and unlike all other birds, Inkayacu's wing feathers were radically modified in shape, densely packed and stacked on top of each other, forming stiff, narrow flippers. Its body feathers had broad shafts that in living penguins aid streamlining the body.

Bird feathers get some of their colors from the size, shape and arrangement of nanoscale structures called melanosomes. Matthew Shawkey and Liliana D'Alba, coauthors at the University of Akron, compared melanosomes recovered from the fossil to their extensive library of those from living birds to reconstruct the colors of the fossil penguin's feathers.

Melanosomes in Inkayacu were similar to those in birds other than living penguins, allowing the researchers to deduce the colors they produced. When the team looked at living penguins, they were surprised to find their colors were created by giant melanosomes, broader than in the fossil and in all other birds surveyed. They were also packed into groups that looked like clusters of grapes.

Why, the researchers wondered, did modern penguins apparently evolve their own special way to make black-brown feathers?

The unique shape, size and arrangement of living penguin melanosomes would alter the feather microstructure on the nano and micro scale, and melanin, contained within melanosomes, is known to give feathers resistance to wear and fracturing. Perhaps, the researchers speculate, these shifts might have had more to do with hydrodynamic demands of an aquatic lifestyle than with coloration. Penguin colors may have shifted for entirely different reasons related to the later origin of primary predators of extant penguins such as seals or other changes in late Cenozoic seas.

"Insights into the color of extinct organisms can reveal clues to their ecology and behavior," said co-author Jakob Vinther at Yale University, who first noted fossil preservation of melanosomes in bird feathers. "But most of all, I think it is simply just cool to get a look at the color of a remarkable extinct organism, such as a giant fossil penguin."

Inkayacu paracasensis (een-kah-yah-koo par-ah-kah-sin-sis) was discovered by Peruvian student Ali Altamirano in Reserva Nacional de Paracas, Peru. Inkayacu's body length while swimming would have been about 1.5 meters (five feet), making it one of the largest penguins ever to have lived. When the team noticed scaly soft tissue preserved on an exposed foot, they nicknamed it "Pedro" after a sleazy or "escamoso" (scaly) character from a Colombian telenovela.

The latest discoveries add to earlier work by Clarke and her colleagues in Peru that challenges the conventional vision of early penguin evolution. Inkayacu and other finds show there was a rich diversity of giant penguin species in the late Eocene period (about 36 to 41 million years ago) of low-latitude Peru.

"This is an extraordinary site to preserve evidence of structures like scales and feathers," said Clarke. "So there's incredible potential for new discoveries that can change our view of not only penguin evolution, but of other marine vertebrates."

The fossil is part of the permanent collection of the Museo de Historia Natural-UNMSM in Lima. An exhibit by expedition co-leader Rodolfo Salas about the fossil will open at the Reserva Nacional de Paracas in November.

The National Geographic Society and the National Science Foundation provided funding for the research.

The paper, "Fossil Evidence for Evolution of the Shape and Color of Penguin Feathers," will appear later in a print edition of the journal. In addition to Clarke, Shawkey, Alba, Vinther and Altamirano, co-authors are Daniel T. Ksepka (North Carolina State University), Rodolfo Salas-Gismondi (Museo de Historia Natural-UNMSM), Thomas J. DeVries (Burke Museum of Natural History and Culture) and Patrice Baby (IRD and Université de Toulouse, France).

View a gallery of images and video online.

For more information, contact: Marc Airhart, College of Natural Sciences, 512 232 1066.

7 Comments to "Fossilized Giant Penguin Reveals Unusual Colors, Sheds Light on Bird Evolution"

1.  Steve Garcia said on Oct. 2, 2010

Could it be that Kurt Vonnegut's "Galapagos" was right? Maybe we had to re-evolve from apes to our current evolutionary state all over again.

2.  John said on Oct. 7, 2010

How does this answer any questions they had about penguins' ancestors? They found a fossil of a giant penguin with different colored feathers. Big whoop. I'm not a biologist, but this just seems like a story for a slow news day.

3.  Alan McKendree said on Oct. 11, 2010

Anyone else notice this "unusual color" is pretty much burnt orange? :-)

4.  Darion Hay said on Oct. 14, 2010

I don't understand how color could be deprived from the bones. It doesn't really make sense. Besides don't bones change color when they deteriorate?

5.  Stephen Ray Hale said on Oct. 19, 2010

Darion Hay - that is the point. They did not derive the color from bones but from the Melanosomes, organic products that SHOULD have deteriorated given 20 or so million years...and you should be askanse at that. Perhaps their DATING methods should be held in question. Perhaps millions of years should not be in the formula for giving the age of the earth. Organic materials actually are unstable in real, observable time.

6.  Stephen Ray Hale said on Oct. 19, 2010

By the way, though I am skeptical concerning the science fiction of evolution, as a geologist, I am pleased to nearly being proud of the candid photos of the actual fossil remains seen when you click on the above link of the gallery of images and video online. One recommendation to the Marc Airhart contact above is that they make Stereoscopic pair photos at all their sites to increase the information value of the documentation according to the law of two or three witnesses that establishes a matter such as that found in the Torah of Moses.

7.  M said on Aug. 22, 2011

Dear Darion Hay, do you mean derived?