Skimmers have unusually long lower bills to allow them to skim-feed over water surfaces while flying. Something I only realized today while sectioning? All of that underbite is keratin; the actual bone is the same length on both the upper and lower jaw!

(model from Morphosource)

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2021-11-28

Great new Palaeontologica Electronica publication by Aime Rankin, Bob Emory, and Rob Asher: https://t.co/i1L3Y2OdWt. Beautiful specimens of Eocene fossil rodents archived on MorphoSource: https://t.co/UoFXdXjmHZ

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2020-06-30