It's called the Red sometimes, and basically she can take on the properties of just about any animal just by saying it's name.
Ex: Blue Whale. She says that while she's falling on you, it's gonna hurt. For a little bit she could absorb human powers and abilities, since humans are animals as well. She was kind of like a mix between beast boy and Rogue, except she didn't turn into the animals, and she didn't hurt you when she took your power.