Euprymna scolopes!

A neat little video of a neat little squid that you all got a chance to see in lab:

Note the burying behavior — during the day, these guys bury themselves with sand to escape predation. Generally, they only emerge at night to hunt. On their underside is a light organ that is colonized by bioluminescent bacteria — Vibrio fischeri — which they use for countershading by matching the aperture of the organ to the luminosity of the moonlight coming down.

More on the symbiosis here:

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