 Ants of this genus are popularly known as bulldog ants , bull ants or jack jumper ants . This is due to their ferocity and the way they hang off their victims using their mandibles , and also due to the jumping behaviour displayed by some species . Other common names include inch ants , sergeant ants and soldier ants . The jack jumper ant and other members of the Myrmecia pilosula species group are commonly known as " black jumpers " , " hopper ants " , " jumper ants " , " jumping ants " , " jumping jacks " and " skipper ants " . 
