... available in small, medium & large, this must-have fashion accessory can be set to chortle or yell on command or for more introspective moments, simply vibrate and/or warm your pate.-- FlyingToaster, Apr 18 2009 A Tribble is probably a native of the same planet as the xenomorph. Enough for feed but poor characteristics for parasitic regeneration .-- wjt, Apr 19 2009 that would explain the temperament... maybe they're the xm equivalent of popcorn.-- FlyingToaster, Apr 19 2009 both of their temperaments.-- wjt, Apr 19 2009 random, halfbakery