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In the mirror universe, the Pahkwa-thanh were a species of space-faring reptiles which were allied with the Klingon-Cardassian Alliance during the 24th century. They are large, powerfully built bipeds with strong jaws, sharp teeth and a passing resemblance to a therapod dinosaur.
Carnivorous and predatory by nature, the Pahkwa-thanh feed upon live prey. Their spiritual beliefs encouraged the understanding that their prey animals are sentient and in possession of a soul. Pahkwa-thanh propriety precluded hunting any sapient species that did not accept its role as prey.
In spite of the fact that the Klingons were generally not comfortable with sentient species shaped differently than themselves, they respected the Pahkwa-thanh's predatory nature. The Klingons had lost thousands of warriors to their failed attempt to conquer the Pahkwa-thanh homeworld. Granting such honourable and songworthy deaths to so many warriors was the Klingon idea of a generous diplomatic overture so the two species became stalwart allies.
In 2376, Doctor Shenti Yisec Eres Ree was a Pahkwa-thanh medical researcher in the service of the Alliance who conducted experiments on the Irriol population of Lru-Irr. (TTN - Mirror Universe short story: "Empathy")