It's hard to say what animal Biggie (Rodrigo Santoro) gets his abilities from. After being shot in the hand by Art, he takes a pill allowing him to grow in size and turn into an absolutely grotesque creature. We also see that his eye begins to split, which suggests that his powers are from an amalgam of creatures. Seeing as he gets his pill from a charm he wore around his neck, I feel it's safe to say that it wasn't the same version of power everyone else was receiving.