Andorian - Biology

Biology

Andorians have blue blood, blue skin, white hair, and antennae on the crown of the skull. By the time of Star Trek: Enterprise, the antennae were depicted as protruding from the forehead, and capable of movement, used for gesturing and balancing. If cut off, an antenna will grow back after nine months, though the time can be reduced by half with electrical stimulation and brisk cranial massage.

There are at least two Andorian subspecies: those with blue skin, the majority of the population; and the more reclusive, blue-white-skinned Aenar, long considered a myth until contact was remade with blueskins circa 2154 in the episode "The Aenar". The Aenar are blind, but exhibit telepathic and telemetric abilities. Aenar appear to use their antennae as telepathic receptors.