 <unk> in habits , the tawny nurse shark tends to spend the day resting in piles of two dozen or more individuals inside caves or under ledges . At night , it is an active @-@ swimming predator that uses a powerful <unk> force to extract prey from inside holes and crevices . The diet of this species consists mainly of <unk> , though they also take other invertebrates , small bony fishes , and rarely sea snakes . It is aplacental viviparous , meaning the embryos hatch from egg capsules inside the mother . It is the only carpet shark in which the embryos are <unk> , feeding on eggs produced by the mother while inside the uterus . The litter size may be as small as one or two , based on the large size of near @-@ term embryos . 
