Photo © Jodi J. Rowley/Australian Museum
Don't let their large eyes fool you, the Yin-Yang frog (Leptobrachium leucops) measures only 1.5 inches long! Discovered in 2011, this species is found in the upper elevations of the Langbian Plateau in southern Vietnam.
Stuart et al (2011) Zootaxa 2804: 25–40
Article: "Singing frog and 'walking' catfish among 126 new species discovered in Mekong basin – in pictures"