Waterworlds Stickleback Beaver

S1 E1: The Fascinating Migration Of The Stickleback Is Captured For The First Time On Film From The Starting Point In The North Sea Through Sea Locks To Their Breeding Grounds Far Upriver In A Beaver Pool Beavers Build An Ideal Breeding Ground For The Stickleback But Its Also An Expanding Home To Scores Of New Creatures Including The Ringnecked Grass Snake