Tuckos are the biggest species of Gecko on the planet,I once watched one stalk and eat a ticki,I have a friend with an aviary of small finches on his garden,he told me some of his chicks were eaten by a tucko,I caught one once which drew blood when it began gnawing my knuckle Could be worse though,I saw Komodo dragons in Indo,at least we dont have them racing around the ceilings