Gands are insectoids who evolved on the planet Gand. There are two main sub-species of Gands: those with lungs, which are very rare, and those without. Gands with lungs are adapted to Gand's ammonia-rich atmosphere, but they are poisoned by oxygen and must use a special breathing apparatus if they want to leave Gand. Gands without lungs have special regeneration properties, demonstrated by their ability to recover quickly from injuries and even re-grow lost limbs (As shown by Ooryl Qrygg in the X-wing series by Michael Stackpole).