Did the Iconic Archaeopteryx Lose Its Ability to Fly?

The early bird's anatomy matches that of modern flightless birds, a paleontologist says

Stocktrek Images, Inc./Alamy



The idea that it was instead evolving to lose its flight and becoming flightless again, or 'secondarily flightless', occurred to Habib while he was calculating limb ratios and degrees of feather symmetry in Archaeopteryx, and comparing the values to those of living birds, to better understand its flying ability. In doing so, he found that the creature's traits were surprisingly similar to those of modern flightless birds such as rails and grebes that frequently dwell on islands.



“Just because Archaeopteryx was the first feathered dinosaur found, doesn’t mean it has to play a central role in the actual history of the origins of birds,” says paleontologist Thomas Holtz of the University of Maryland in College Park. “We have to remember it appears 10 million years or so after the oldest known bird-like dinosaurs and so our famous 'first bird' may really be a secondarily flightless one.”

Ruffled feathers
But many are skeptical. “I am wary to call Archaeopteryx secondarily flightless, since we do not yet know if its ancestors could fly,” says Ashley Heers, a biologist at the Royal Veterinary College in Hatfield, UK.

Habib's presentation, along with others exploring what ancient birds could and could not do, has sparked intense interest in variations between the anatomies of modern birds that display different behaviors.

“Living birds use their wings for so many different things, like flap-running up slopes and rowing across water,” says Heers. “We really need an improved understanding of how anatomy relates to these diverse behaviors, so we can better interpret the fossil record.”

And to drive the matter home, Heers and her colleague Kenneth Dial, a biologist at the University of Montana in Missoula, pointed out at the conference that there are many birds that are better fliers as juveniles than as adults and that a few species even lose flight completely as they mature. “Perhaps young Archaeopteryx flew, but adults were more ground-based,” suggests Holtz.

If this proves true, then the answer to the question of whether Archaeopteryx flew could prove an infuriating “sort of”.

This article is reproduced with permission from the magazine Nature. The article was first published on November 12, 2013.

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