It’s a battleground. To survive on this front line between two very different worlds requires endurance and ingenuity.

Originally released by BBC Worldwide Learning, 2017. Streaming video file encoded with permission for digital streaming by Infobase on April 20, 2018.

Costa Rica Shallows (2:44); --Galapagos Islands (7:55); -- Rock Pools (5:37); -- Low Tide (5:32); -- Wave Impact (3:41); -- Sea Birds (7:07); -- Terrestrial Fish (3:37); -- South Georgia Island (7:48); -- Vulnerable Coastlines (3:09); -- Credits: Coasts (0:34); .