Red Wigglers need oxygen just as much as humans do. The interesting fact is they do not have a pair of lungs. They absorb the oxygen into their outer layer from the moist environment in which they live in. They also have the ability to excrete carbon dioxide from their outer layer. It is very important to monitor the moisture level in the worm bin. If it is too dry, they may suffocate – too wet, they may drown. But if it’s just right, you’ll have happy Red Wigglers making poop for you.