Mesohippus bairdi (skull)

Name: Mesohippus bairdi (skull) with humerus bones 

(horse)

Age: oligocene, brule formation

Origin: shannon county, South Dakota, USA

Size: 16 x 9 cm 

Mesohippus bairdi is an extinct species of horse that lived during the Oligocene epoch, approximately 30-35 million years ago. Fossils of this species have been found in various locations across North America, including South Dakota, Nebraska, Wyoming, and Montana.

The skull of Mesohippus bairdi is relatively small and narrow, with a pointed snout and teeth that were adapted for grazing on tough vegetation. Its braincase was also relatively small, indicating that it had a relatively small brain compared to modern horses.