Red Mid-Water Comb Jelly

Photograph of a translucent red-orange comb jelly against a black sea.
Marsh Youngbluth/MAR-ECO, Census of Marine Life

Like this ctenophore (Aulococtena acuminata), many animals that live in the midwater zone are red—making them almost invisible in the dim blue light that filters down from the sea surface. This small comb jelly snares prey with its two short tentacles. Read more about the deep sea and comb jellies.