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Hatzegopteryx

Hatzegopteryx, a Cretaceous pterosaur, stretching out on a beach.
Hatzegopteryx, a Cretaceous pterosaur, stretching out on a beach. Image: Apple

Pterosaurs were ancient flying reptiles that coexisted with dinosaurs. In this image, you can see how the animals’ wings were made of thin membranes that stretched from one elongated finger to their feet. Their wings are visually more similar to those of bats than birds—and it’s cool to think about how flight evolved independently across mammals, birds, and reptiles.

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