A Pyrithian bat was a flying mammal with white fur and primarily dieted on snow beetles and moth larvae. The bat's natural predator was the Pyrithian moon hawk.
Doctor Phlox kept a pet female Pyrithian bat among his many animals aboard Enterprise. (ENT: "Fight or Flight") Once, while musing about Humans' unique affinity for indulging an emotional bond with pets, he admits to himself that he has talked to his Pyrithian bat. (ENT: "Dear Doctor")
In 2152, while Captain Archer spent a night in Sickbay, the Doctor's bat got out. The two spent part of the night trying to capture it, and Dr. Phlox made a paper Pyrithian moon hawk and tried to impersonate the call of it to scare the bat. It was less than successful, but Hoshi Sato was able to catch it relatively simply. (ENT: "A Night in Sickbay")
In the Delphic Expanse, Dr. Phlox offered Malcolm Reed some of his bat's moth larvae to eat, after Reed had transformed back from being Loque'eque, and still found his stomach was sensitive to Human food. (ENT: "Extinction") He later used his bat as a distraction while he dispatched a Triannon guard in November of 2153. He claimed that there was no antidote for its venom, though it was uncertain whether it was not actually venomous. (ENT: "Dear Doctor") He told the bat not to bite his fingers again whilst feeding it a moth larvae, just before he eats one himself. (ENT: "Chosen Realm")
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