By the start of the Eocene Epoch about 56 million years ago, North America was also home to omomyiforms, a group of tarsier-like primates, and adapiforms, which were more lemur-like.
到大约 5600 万年前的始新世开始时,北美也是 omomyiforms(一群像眼镜猴的灵长类动物)和 adapiforms(更像狐猴)的家园。