Neither water nor land were safe for Hesperornis: Dinosaurs were terrestrial threats, and the aquatic mosasaur giant Tylosaurus was known to consider Hesperornis a tasty meal. On the water ...

Squirts of dark inky fluid sometimes helped the squid blind and confuse predators like the mosasaur Tylosaurus and a barracuda-like fish called Cimolichthys long enough for escape.