ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Black lionfish (Pterois volitans) hiding in coral. This lionfish hides in crevices and under ledges during the day but goes out searching for shrimps and crabs at night. It is one of the largest lionfish; it can grow up to 30 centimetres in length. All lionfish are venomous. Every hard spine in the fins has a pair of venom glands at the base, which are activated when the hard spines are pushed. The venom that is released is a protein that causes intense pain. In very sensitive people, it may affect the heart.
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