An alligator.

An alligator is a reptilian animal. They can be extremely deadly with the strength in their jaws.

Alligator's live in the river that runs past Donavin Conrad's villa. During Abbey Chase's escape, she ran across the alligators to get to the other side of the water. This is a direct reference to Live and Let Die in which James Bond, played by actor Roger Moore, pulled off the exact same stunt.