His training as a xenobiologist kicked in as he ticked off the particulars of the species phenotype: Bilaterally symmetrical and bipedal, and as a consequence with differentiated limbs for arms and legs; their knees bent the wrong way. Roughly the same size and body plan, which was unsurprising as an inordinately large number of so-called intelligent species were bipedal, bilaterally symmetrical and roughly similarly sized in volume and mass. It was one of the things that made interspecies relationships in this part of the universe as contentious as they were. So many similar intelligent species, so little usable real estate for all their needs.

But now the differences emerge, thought Cainen, as the creature barked at him again: A broader torso and abdominal plain, and a generally awkward skeletal structure and musculature. Stump-like feet; club-like hands. Outwardly obvious sexual differentiation (this one in front of him was female, if he remembered correctly). Compromised sensory input thanks to only two small optical and aural inputs rather than the optical and aural bands that wrapped nearly entirely around Cainen's head. Fine keratinous fibers on the head rather than heat-radiating skin folds. Not for the first time, Cainen reflected that evolution didn't do this particular species any great favors, physically speaking.

It just made them aggressive, dangerous and damned hard to scrape off a planet surface. A problem, that.

The creature in front of Cainen jabbered at him again and pulled out a short, nasty-looking object. Cainen looked directly into the creature's optical inputs.

"Fucking humans," he said.

The creature swiped him with the object; Cainen felt a jolt, saw a multicolored dance of light and fell to the ground for the last time that day.

"Do you remember who I am?" the human at the table said, as Cainen was led to the room. His captors had provided him with a stool that accommodated his (to them) backwards-facing knees. The human spoke and the translation came out of a speaker on the table. The only other object on the table was a syringe, filled with a clear fluid.