ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Spotfin lionfish (Pterois antennata) being studied by a diver. This lionfish hides in crevices and under ledges during the day but goes out searching for shrimps and crabs at night. It can grow up to 20 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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