This is a moss terrarium, not a CP terrarium, which is how he came in, it's all locally gathered moss, so I assume the little guy must have hitchhiked in on a clump. (I drowned them before putting them in, to cut down on the wildlife transported, but obviously that doesn't always flush out everything, as demonstrated here!) I went ahead and put him back in after taking the photo, because dang if he's not completely adorable! He can eat all the moss and fern leaves he likes, at least until he starts getting too big to be cute anymore.