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Smithsonian scientists use fossil feathers reveal lineage of extinct, flightless ibis
Date:11/22/2011

A remarkable first occurred recently at the Smithsonian's National Museum of Natural History when ornithologists Carla Dove and Storrs Olson used 700- to 1,100-year-old feathers from a long extinct species of Hawaiian ibis to help determine the bird's place in the ibis family tree. The feathers are the only known plumage of any of the prehistorically extinct birds that once inhabited the Hawaiian Islands.

Discovered with a nearly complete skeleton, the feathers retained enough microscopic structure to allow the scientists to confirm the classification of the bird, known by its scientific name Apteribis sp, as a close relative of the American white ibis (Eudocimus albus) and scarlet ibis (Eudocimus buber). DNA analysis confirmed this classification.

Remarkably, the feathers also retained enough pigmentation for Dove and Olson to determine that the bird was brown-black to ivory-beige in color. This is a first―the plumage color of any prehistorically extinct Hawaiian bird up until now had been speculation.

Apteribis sp. is one of only two species of flightless ibis, both now extinct. Its skeleton differs so much from its mainland ancestors that the bird's relationship to other ibises could only be determined through the study of its feathers and DNA analysis.

"This find is highly unusual because feathers do not preserve well and often decay before a bird is fossilized," Dove said. "These weren't fossil imprints in a rock, but feathers and bones we could actually pick up."

Exceptional geologic circumstances led to the preservation of the feathers inside a lava cave on the Hawaiian Island of Lanai. The floor of the cave was partially covered in a deep layer of flaky gypsum crystals, which, for hundreds of years absorbed humidity in the cave and created an arid environment ideal for preservation of the feathers.

From a taxonomic standpoint feathers are significant because the sha
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Contact: John Gibbons
gibbonsjp@si.edu
202-633-5187
Smithsonian
Source:Eurekalert  

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