Akaka Falls, at 442 feet, is the tallest on the Big Island of Hawaii and very impressive – powerful even – when up close. We were told of the ʻoʻopu ʻalamoʻo, an endemic Hawaiian species of goby fish, that spawns in stream above the waterfall, but matures in the sea. Checking with Wikipedia, it says these fish have a suction disk on their bellies that allows them to cling to the wet rocks behind and adjacent to the waterfall. Using this disk, they climb back up to the stream when it is time to spawn. Now that’s impressive!