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Big brains may have helped birds survive dinosaur-killing asteroid - Yahoo! Voices

Big brains may have helped birds survive dinosaur-killing asteroid - Yahoo! Voices

Big brains may have helped birds survive dinosaur-killing asteroid - Yahoo! Voices
Aug 01, 2021 2 mins, 29 secs

The creature, known as Ichthyornis, is considered an early bird -- but not part of the lucky lineage that survived the mass extinction and gave rise to modern birds.

Now, a newly discovered Ichthyornis fossil sheds light on why some early birds survived the asteroid-triggered catastrophe known as the K-Pg extinction, while close relatives like Ichthyornis perished.

The key may have been a vastly expanded forebrain -- a trait that all modern birds possess, but Ichthyornis and other extinct lineages lack.

The earliest known bird is Archaeopteryx, which lived about 84 million years before the K-Pg extinction.

In contrast, the forebrains of all modern birds are hugely enlarged, spreading above the optic lobes and pushing the whole brain into a new arrangement.

There are dozens of other known bird species that lived between Archaeopteryx and the K-Pg extinction, but until now, researchers had no idea how their brains were shaped.

Ichthyornis is one of the closest known relatives of living birds, and the new specimen lived just 5 million years before the K-Pg extinction.

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