Ocean current which flows off the park provides rich diversities of marine ecosystems including sea birds, sea turtles including critically endangered hawksbill turtles,[8] sharks such as bull sharks[9] and whale sharks,[10][11] and smaller to medium-sized cetaceans.[12][13][14][15] The area was once a major wintering ground for sperm and baleen whales[16] especially humpback whales that migrated into Nan Wan and Banana Bay.[17] Japanese whaling during Japanese colonial days,[18][19][20] led to severe depletions or disappearances of whales in consequence. Today, no or very few whales may constantly migrate along Hengchun Peninsula and into the park's waters.[21][22][23] Dugongs, thought to be either fully or functionally extinct in Taiwan, were reported in 1950s and 60s, and these were some of the last report of the species in Taiwanese waters.[24]
