Ancient Penguins Were Giant, Colorful Beasts, New Fossils Reveal

By Stephanie Pappas

Penguins didn't always boast tuxedo-like black-and-white markings, according to a new study. The discovery of the first ancient penguin fossil with evidence of feathers reveals the aquatic birds were once reddish-brown and gray.

The 36 million-year-old fossil represents one of the largest ancient penguins ever found. The bird would have been 5 feet (1.5 meters) tall, and probably weighed twice as much as modern Emperor penguins, which average about 66 pounds (30 kilograms). Its long, grooved beak suggests that, like modern penguins, it hunted by diving for fish.

Imprints of feathers in the rock around the bones could help researchers understand how modern penguin feathers evolved, said Julia Clarke, a paleontologist at The University of Texas at Austin and a co-author of the paper.

"It's the first evidence of the soft tissues of extinct penguins," Clarke said.

The fossil, a new species named Inkayacu paracasensis (or "Water King"), was discovered in the Reserva Nacional de Paracas, a desert preserve on the coast of Peru. Researchers in the field noticed evidence of scaly skin on the fossil foot, prompting suspicion that more evidence of soft tissue might have been preserved. When Clarke examined the specimen in the lab, those suspicions proved true.

"I turned over a flake of rock right near one of the wing elements, and right there was our first evidence of feathering," she told LiveScience.

To find out what color those feathers might have been, the researchers examined the shape of the penguin's melanosomes. These tiny structures resembling pockets contain pigment cells that help give bird feathers their color. The analysis showed that the ancient feathers were likely reddish-brown and gray. [Image of ancient reddish-brown penguin]

"The plumage of these animals was in a very different palette of what we see in living penguins today," Clarke said.

While comparing the ancient penguin's melanosomes to modern birds, the researchers noticed another oddity: Modern penguin melanosomes are different from those of other modern birds. They're broader and clustered in patterns not seen in other species.

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