Now they think it lived on dry land, probably in herds.
The animals are often very large, and they frequently go about in great herds.
The kind that had men banging at her door in herds.
They gather in herds which can include many thousands of individuals.
It is believed that at least some forms lived in herds.
There are now 3,000 to 3,500 buffalo in the park's herd.
Females gather in herds of between two and 600 individuals.
That includes about 20,000 elk in the park's northern herd.
They travel in herds of females and their young led by one or two strong males.