Assertion: mastodon | /r/CapableOf | enter north america
Facets:
Source sentences:
text: Mastodons are an older species, originating in Africa 35 million years ago and entering North America about 15 million years ago.
text: Mastodons (Mammut) entered North America about 15 million years ago, traveling over the Bering Strait land bridge, long before their relative, the mammoth, according to the Yukon Beringia Interpretive Centre in Canada.