Amazon milk frog - The Mission golden-eyed tree frog or Amazon milk frog (Trachycephalus resinifictrix) is a large species of arboreal frog native to the Amazon Rainforest in South America. It is sometimes referred to as the blue milk frog. It was first discovered along the Maracanã River in Brazil.
The big-eyed tree frog, or peacock tree frog (Leptopelis vermiculatus) is a species of frog found in forest areas in the African country of Tanzania. In some literature, it is referred to as the Amani forest tree frog.
New Caledonian Crested Gecko licking its eye An equally easy answer is it's because some species of gecko (again, like the crested gecko) don't have eyelids. Therefore, they use their tongues and saliva to keep their eyes moist and clean.