Also would like to add on to this a bit so the references make a bit more sense, the monsters are not all the same size both of the first of my posts are about half the size of a blockhead, the megatank(The ball) is about the size of a 16x16 cube. The crab like monster is pretty big, I would guess about twice the size to three times the size of a blockhead.
The hornets should also be about half of the size of a blockhead also.