These frogs are great. I used to have a couple when I was going to college. I actually used them in a demonstration I did on frogs for my zoology class. I put one of these guys in a Sterlite container with a bunch of leaf litter and asked the class to stand next to the table it was on and see if they could spot the frog without touching the container. Once they found the frog, they were supposed to sit down. Well after about 10 mins, I still had about 5 people standing there staring into the box that couldn't find the frog and it was PLENTY visible.