GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Papuan cuttlefish (Sepia papuensis), courtship. Male cuttlefish compete for dominance and the best den during mating season. The successful male cuttlefish clasps the female with its tentacles and uses a specialized tentacle to insert a sperm sac into an opening near the female's mouth. The male then guards the female until she lays her eggs a few hours later. Photographed in West Papua, Indonesia.
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