But the animal kingdom abounds with real-life superheroes whose abilities would make any comic book crusader jealous. (See "Like 'Deadpool,' This Jellyfish Has Amazing Superpowers.")

Many species have evolved ingenious strategies to find mates, escape dangers, or just score a meal. 

Take the secretive, deep-sea catsharks that use biofluorescence to become more visible to each other, according to a new study.

These little-known fish generally live deep enough that they are bathed only in blue light, since the rest of the wavelengths of light are blocked by the water above. The sharks have a special, as-yet-unidentified pigment in their skin that absorbs blue light and re-emits