Crocodile had many Bananawani as pets in his old casino that got destroyed in Rainbase. He could control them as they were often seen in the room with him and Nico Robin without any sort of aggressive attitude toward either of them. Crocodile seems to have had them well-trained as they would also follow his commands, such as eating Mr. 3 and the key he dropped into their den merely by looking at one. Their stomach acid is resisted by Mr. 3's wax.