Camurodon borealis tooth: The shape of the tooth suggests that the early mammal likely ate mostly plants. Credit: Shelley et al.

Camurodon borealis tooth: The shape of the tooth suggests that the early mammal likely ate mostly plants. Credit: Shelley et al.

Camurodon borealis tooth: The shape of the tooth suggests that the early mammal likely ate mostly plants. Credit: Shelley et al.