Before revision: The dispersal of anthracotheres from Asia to Africa about 40 Ma ago, and the much more recent dispersal of hippos (relatives and probably descendants of anthracotheres) from Africa to Madagascar may have occurred by floating or swimming.
After revision: The dispersal of anthracotheres from Asia to Africa about 40 Ma ago, and the much more recent dispersal of hippos (relatives and possible descendants of anthracotheres) from Africa to Madagascar may have occurred by floating or swimming.