BEAVERS HOLDS ITS BREATH FOR 15 MINUTES. LONGER THAN A DOLPHIN. ITS TEETH ARE ORANGE. REINFORCED WITH IRON. SELF-SHARPENING. IT HAS TRANSPARENT EYELIDS. SEES UNDERWATER WITH EYES CLOSED. IT HEARS RUNNING WATER AND MUST BUILD A DAM. CAN'T STOP. SCIENTISTS PLAYED WATER SOUNDS TO BEAVERS. THEY TRIED TO DAM THE SPEAKER.