Land bridges are natural land formations that connect two larger land masses, allowing animals and plants to migrate between them. One famous example is the Bering Land Bridge, which once linked Asia and North America during the last Ice Age. This connection enabled various species, including early humans, to travel and settle in new areas. These bridges can form due to changes in sea levels, often during ice ages when water is trapped in glaciers. As the ice melts and sea levels rise, these land bridges can disappear, isolating populations and leading to unique evolutionary paths.