Our high-resolution images will enable comparative studies of the PCF avialan teeth with those from lower-latitude formations, allowing us to better propose and test hypotheses relating to the biogeography, physiology and evolutionary history of Late Cretaceous birds.

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To image these PCF teeth as best as possible, we used non-destructive, high-resolution scanning electron microscopy. This technique eliminates common issues with visualizing small teeth, including glare that can obscure details such as fine enamel ornamentation.

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Fossil bird bones are delicate, so bird teeth, which are far more likely to preserve in the fossil record, represent a unique opportunity to fully appreciate Mesozoic avialan richness. Out today in RSOS, we describe 105 bird teeth from the Cretaceous of northern Alaska. 🧵

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@stephlechki.bsky.social

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Don't miss the latest issue of Evolution: academic.oup.com/evolut/issue... On the cover: Hummingbird coloration is not driven by changes in light environment, but can remain an effective tool of communication despite variation in the background. doi.org/10.1093/evol....

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