Peron’s Tree Frog, Emerald Spotted Tree Frog, Laughing Tree Frog or the Maniacal Cackle Frog (Litoria peronii) is one of the most varied coloured frogs in Australia, with the ability to change color in less than one hour. It varies in shades of grey and brown, where its lightest is almost white. The frog has mottled yellow and black thighs, armpits and groin. Occasionally emerald spots are found on the back, which increase in number with age. A characteristic uncommon in the Litoria genus, is pupils which appear cross shaped.