Later that year, while musing about Humans' unique affinity for indulging an emotional bond with pets, he admitted to himself that he has talked to his Pyrithian bat. (ENT: "Dear Doctor")
In 2152, while CaptainArcher spent a night in sickbay, the doctor's bat got out. The two spent part of the night trying to capture it, and 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, 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 not actually venomous. (ENT: "Dear Doctor") He told the bat not to bite his fingers again while feeding it a moth larvae, just before he ate one himself. (ENT: "Chosen Realm")
In the final draft script of "A Night in Sickbay", the Pyrithian bat was described as "large" and "dark blue." In ultimately omitted dialogue from the final draft script of "Damage", Phlox mentioned to T'Pol that his Pyrithian bat was in heat and that, as a result, it very often made a "cooing" noise that Phlox described as "incessant" and "trying".