Those land routes would have been somewhat similar to other ocean crossings, such as the Bering
land bridge humans traversed around 23,000 years ago between Asia and North America (,SN: 8/22/15, p.
It would compete with Canadian and US
land bridges that transport the majority of international trade, and the Panama Canal.
These can be culverts under roadways for small mammals and reptiles to
land bridges over interstates for large animals.
Some biologists also think ancient
land bridges between islands or even continents offered another route that animal populations used to migrate, or move from one place to another.
In contrast, Beard theorizes that Teilhardina migrated from Asia across
land bridges to North America and then to Europe.