Space Mice

... the animals are then euthanized by exsanguination and cervical dislocation. 

https://www.nasa.gov/mission_pages/station/research/experiments/2283.html

Wonder how it feels being a mouse on the space station.  First of all you have to get there - all that nasty hi-G launch stuff.  Then no one ever explains the notion of weightlessness to a mouse, so you have no idea why your feet won't stay on the floor.  and the final indignity:  they bleed you dry (literally), break your back and (presumably) stuff you in the trash to burn up on re-entry.

Not complaining really.  It's science.  Furtherment of the human race, and all that.