Video by @bertiegregory. Rockhopper penguins have got to be one of the toughest animals on the planet. After battling through the open ocean in search of food, this group of adults is returning to their colony on Sea Lion Island in the South Atlantic Ocean. In order to reach their hungry chicks at the top of the cliff they must first time their exit to perfection. Although the rocks and waves are potentially dangerous to the penguins, they are experts in using the power of the wave to eject them out the water and up the cliff. Even though I know they are built like little tanks and they have done this many times before, it’s still nerve-wracking to watch! Shot as part of a new online series for National Geographic. Follow @BertieGregory for more wildlife videos and to find how I got the shot.