What unusual player races do your games include?
Most of the players I play with would rather stick with the core races, so I tend to just make up NPC races to keep them on their toes. I stole the pangolin idea, for instance, and have been working on a generic lion-people race. I had a crazy idea for a sentient magic library to start making its own golems that are powered by magical books.
For my fantasy setting, Bunny people.
For my other settings, case by case basis.
Meralken, wild-magic infused, totemic/shamantic mask-wearing not-quite-humans.
Kobaloi (sing: Kobalos), tall and anorexic humanoids that look like fucked-up lovechildren of 3.5 Displacer Beasts and American McGee's Cheshire Cat.
Beastfolk, animal-headed humans that look like Egyptian deities, created by an insane wizard as a slave army.
Raknids, basically great-dane-sized (and surprisingly friendly) tarantulas.
Awakened, self-willed eidolons without a master.
So basically, a lot.
Prehistoric species of human.