Smithsonian NMNHさんのイラストまとめ

77 MYA, Late Cretaceous: Two dinosaurs, Troodon (on the ground) and Avisaurus (in the tree) eye one another. They are both members of the Eumaniraptora – a related group that includes the “raptor” dinosaurs and all birds.

This is a small sample of some interesting and beautiful trilobite shapes. Their segmented body plan (with left, central, and right lobes) was easily modified through adaptation.

We're taking #SmithsonianHistory back to the very first extinct vertebrates on exhibit at the @Smithsonian: plaster casts of a ground sloth (Megatherium) and glyptodont (Glyptodon) on exhibit in 1871. Today, you can come see the real deal in #DeepTime!

Fossil Ichthyosaurs like this one were first discovered in Europe in the early 1800s. Paleontologists studied the extinct marine reptile so often that reconstructions of it were displayed at the Crystal Palace during the World Exhibition of 1851. #SeaMonstersUnearthed

Unlike birds, bat wings don't have to be symmetrical and can create shapes that allow for greater maneuverability. #BatWeek @BioDivLibrary