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Humans don't smile in space. They learnt early on that showing ones teeth is a threat. Animals show teeth, not sapient races. Smiling is reflexive, however, and cannot always be suppressed.
The volatus was sitting, as much as volati ever sit, on the bench in the crew relaxation quarters, when crew mate Adam rushed in. The humans forward facing eyes landed on the volatus, and toothy grin grew larger.
"One Who Is Free!"
The human could barely contain the volume of his voice. In a normal situation, the human would have been scolded for the noise, but right now the volatus was transfixed by a detail of the humans teeth. In the front there were the standard, wide, snipping teeth. Their shape was nearly universal to the species that have teeth. However, on either side of these, there were more conical teeth. Teeth whose purpose can only be rending and tearing.
One Who Is Free felt sick. Predation is not common in the universe. Most planets that have sapient life are so kind that predation is never a better option. Species do war, generally for natural resources, but none are made to eat each other. Seeing such a blatant and shameless threat of a horrible death was paralyzing.
Then realization hit. This wasn't a death threat. The briefing for humans explicitly stated that humans show their teeth when happy. The volatus felt sick all over again. What a weird species.
Adam's grin faltered, his lips dropping enough to cover the canines.
"Are you ok?"
The volatus shifted under the gaze of the human.
"Yes"