The barren ground caribou of Canada, makes the longest migration of any land animal.

The herd moves to the high Tundra of the Arctic for the summer.The young ones are born there.

They return to the South in the autumn, making a round trip of bout 1400 miles.

The animals migrate in giant herds of 20,000 individuals.

The long trek enables the herds to feed on the richest available pasture at

each season of the year and survive.