You certainly aren't the first one to call them thumbnails. Size wise, the name fits so I can see why they started getting lumped. Pumilio are variable in their boldness. Some are really shy and others will not stop singing even when you are poking around in the viv inches away. In general the females seem more shy than the males from what I've seen with blue jeans. They also vary in how arboreal they are. Some spend most of their time low in leaf litter but males tend to climb up a foot or two to call and mate. For a really nice bold, arboreal frog with a fantastic call, I think it is hard to beat imitator. They are just really great frogs. Vents are very nice too but their call is just a whisper to my aged ears.verbal said:Thanks for your replies. When phrasing the question, I wasn't quite sure that it was appropriate to call pumilios "thumbnails" (it just felt wrong) - point well taken. I am interested in transitioning from the large and hardy D. tinc group of frogs to the smaller, more arboreal frogs like those in the D. vent group. What got me even thinking about cb pumilios is their reported boldness.