13. Ponyfish model.jpg

Male ponyfish beckon to females with a special pattern of flashing light. The source of the light is a ring of tissue around the male’s throat that is packed with bioluminescent bacteria. Internal structures channel the light to clear patches on the fish’s flanks, where it shines out so females can pick up the signal.
©AMNH\D. Finnin

©AMNH\D. Finnin