They have to be tough. This is a time where there are some awe inspiring predators. Every time hesperornis go on a fishing trip, they have to enter the deadliest sea of all time
— Allen, on Hesperornis
Hesperornis ("Western Bird") was a large, prehistoric, flightless diving bird from the Late Cretaceous. Due to its design, it was cumbersome on land but was a fabulous swimmer.



Hesperornis lived during the Late Cretaceous period 75-65 million years ago.


Hesperornis was a species of Cretaceous sea birds that measured over 6 feet (2 meters) long and looked similar to penguins. They were flightless, like penguins, but they were far from as cute. Inside their dagger-like bills, they actually had teeth. But just to hold their own, Hesperornis had to be tough because they were around a time where there were truly awe-inspiring predators in the seas.


Hesperornis spent most of their lives in water. They were amazingly adapted for diving, with specially heavy bones to help them stay submerged. But few Hesperornis lived to a ripe old age, because where they were from, there are so many ways to get eaten.