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The lower jaw of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

Hesperornis Lower Jaw

The lower jaw of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

The pelvis of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

Hesperornis Pelvis

The pelvis of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

The Hesperornis regalis was an ancient bird of the Cretaceous Period.

Hesperornis Regalis

The Hesperornis regalis was an ancient bird of the Cretaceous Period.

A tooth of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

Hesperornis Tooth

A tooth of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

A vertebrae of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

Hesperornis Vertebrae

A vertebrae of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

A vertebrae of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

Hesperornis Vertebrae

A vertebrae of the Hesperornis regalis, an ancient bird of the Cretaceous Period.

The ichthyornis an ancient bird of the Cretaceous Period.

Ichthyornis

The ichthyornis an ancient bird of the Cretaceous Period.

The jaw bones of the Mosasaurus, a great snake-like reptile of the Cretaceous Period.

Mosasaurus Jaw

The jaw bones of the Mosasaurus, a great snake-like reptile of the Cretaceous Period.

A tooth of the Mosasaurus, a great snake-like reptile of the Cretaceous Period.

Mosasaurus Toot

A tooth of the Mosasaurus, a great snake-like reptile of the Cretaceous Period.