Dogs have been human companions for thousands of years. As the first animal species domesticated, dogs altered human relationships with the natural world and profoundly influenced the course of early human history. New data indicate that dogs most likely accompanied the first explorers as they traveled southward from Siberia and fanned out across the Americas.
Forests of bull kelp, with thick floating masses of brownish-green fronds, have been swaying in ocean waves along the Pacific coasts of the Americas for eons. This marine ecosystem, rich in fish, shellfish, marine mammals, birds and seaweed, made it feasible for the earliest people to migrate by boat southward from Eurasia to South America. We know their route as the Kelp Highway.