Today, people still marvel at creatures that migrate, such as salmon, which can swim thousands of miles in the ocean and return to the stream where they were born, and leatherback sea turtles, which also make incredible journeys.
Kā gan lai neapbrīno, piemēram, lasi, kas mēro vairākus tūkstošus kilometru, lai no okeāna atgrieztos dzimtajā upē?