Trekipedia

Andorians

These humanoid Federation members are blue-skinned in appearance and have bilateral antennae and characteristically white hair.^[1] Andorians have a higher metabolism than humans^[15]. Because of Andorians’ unusual physiology, intravenous injections are not possible; instead, a doctor must use intra-muscular injections.^[2]

Andorian antennae are used, at least in part, for balance. An Andorian is partially disabled and unable to function immediately following the loss of an antenna, but is typically able to compensate after a day or two. Antennae can take up to nine months to regrow, although that can be completed in half the time with electrical stimulation and cranial massage therapy. Loss of antennae is a humiliating experience for an Andorian.^[15] An Andorian’s antennae can also detect subtle shifts in temperature, electrical fields, and emotion.^[16] The movement of an Andorian’s antennae can also indicate emotional states. An Andorian will sometimes point their antennae at a potential mate to signify attraction, though it is unclear if this is a voluntary or involuntary response.^[12]
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