This ghostly gray gecko with spooky yellow eyes was clinging vertically to a large tree trunk, about five feet off the ground, completely exposed. When I got close for photos, it shuffled around the tree to the far side, which was fine with me because the light was better there.

The geckos in this genus have vertical pupils, which typically signifies nocturnal behavior, but this species is generally considered diurnal. It's a very large gecko, probably the longest gecko from snout to tail tip that I've ever seen in the wild, including adult Tokay Geckos in Indonesia.

Here is a list of all the reptiles and frogs I saw on this 2007 trip to Madagascar.