phascolarctos malum or Thylarctos plummetus, depending on what area they are from.
According to Wikipedia (http://en.m.wikipedia.org/wiki/Drop_bear) “A dropbear or drop bear is a fictitious Australian marsupial. Drop bears are commonly said to be unusually large, vicious, carnivorous marsupials related to koalas (although the koala is not a bear) that inhabit treetops and attack their prey by dropping onto their heads from above. They are an example of local lore intended to frighten and confuse outsiders and amuse locals, similar to the jackalope, hoop snake, wild haggis or snipe. 428 more words