Spiny lobsters tend to live in crevices of rocks and coral reefs, only occasionally venturing out at night to seek snails, clams, crabs, sea urchins or carrion to eat. Sometimes, they migrate "en masse", in long files of lobsters across the sea floor. Potential predators may be deterred from eating spiny lobsters by a loud screech made by the antennae of the spiny lobsters rubbing against a smooth part of the exoskeleton . Spiny lobsters usually exhibit social habit by being together. However recent studies indicate that healthy lobsters move away from infected ones and leaving the diseased lobsters to fend for itself .