It is difficult to imagine a snail being swift, sleek and aggressive, but the rosy wolfsnail (Euglandina rosea) is just that. While "swift" is relative, this mollusk does move about fairly quickly as it voraciously hunts and devours other snails. The individual shown here is not full grown. When mature, their shell can be over 2 inches long. While this species is introduced, Texas does have a couple of related (but slightly smaller) snails that are native.