Cormorant (Phalacrocorax sp.) ウ , Great Cormorant (Phalacrocorax carbo) カワウ, Japanese Cormorant (Phalacrocorax capillatus) ウミウ
In Japan there are Great Cormorants and Japanese Cormorants. The Great Cormorants are larger. I am not sure which kind these are. They are waterbirds that dive for fish. The ones that fishermen use to catch fish are the Japanese Cormorants. Here a young one suns itself. Amami 2024
An adult Cormorant suns itself. When they are not fishing, they like to catch some sun. I am sure that it also helps to dry their feathers. Fujisawa 2017