Here is an article about animals with amazing powers of camouflage! One of them included in the lineup is a leaf-tailed gecko that is hiding on a moss and liverwort covered tree trunk. Here is the link to the article and photos.
When hunting for mosses I am often focused on a very specific search image. Crawling along the ground or kneeling in the moss I am usually very focused on the plants and often miss seeing the surrounding animals. My biggest fear when hunting for mosses is that I will run into a snake resulting in starting and scaring us both. I have run into snakes now and again when doing fieldwork. Fortunately I have always seen them with enough time and distance to avoid a dramatic meeting.