Most of the more than 2,000 species of geckos are nocturnal. Many are colored like bark, or in earth tones. In contrast, as their name implies, the 40 or so species of day geckos of the Indian Ocean are diurnal, and include some of the most brilliantly colored of the world’s reptiles. Instead of the cat-like slitted pupils of other geckos, they have round ones, giving them a “friendly” expression. The “Geico Gecko” in commercials is a day gecko. While some species are almost extinct, this one is abundant and often bred in zoos and private collections.