Crazy fish
 Butis butis the Duckbill Sleeper (also known as crazy fish or upside down sleeper) is a species of sleeper goby are native to brackish and freshwater coastal habitats of the Indian Ocean and the western Pacific Ocean from the African coast to the islands of Fiji. They prefers well vegetated waters and can frequently be found in mangrove swamps. They are small drably colored fish reaching a maximum length of only 15 cm (5.9 in).