Face-banded crab uses facial bands to reflect light

The face-banded crab, *Parasesarma eumolpe*, has been discovered to use its facial bands as external light reflectors, functioning like "nature's headlamps" for communication. This is a first for the animal kingdom. Scientists found the crabs' facial bands, which reflect light, act like headlamps, focusing light beams for signaling. These bands are used to communicate with other crabs, especially during competition, and are more attractive to other crabs. The study, published in *Ecology*, highlights the unique external light-focusing structures of the crabs. This behavior is similar to internal reflectors found in other animals, but this is the first instance of it being external.