The moaning frog is named for its call, which sounds like a slow and drawn-out moan. This burrowing frog is native to southwestern Western Australia, where its calls can keep people up at night — it's recommended to gently flood the frog's burrow each night until the moaning male moves on.

The pumpkin toadlet is one of the smallest frogs in the world — only some 18 mm (0.7 in) long. Because of its minuscule size, the organs in its ears that are responsible for balance cease to work mid-jump. As such, it cartwheels rigidly through the air before making a clumsy, floppy landing.

The common reed frog exhibits extreme variation in colour patterns — with some 50 recognised subspecies. Additionally, this frog changes the colour of its skin according to weather and temperature, turning pure white in the heat of the dry season.

The Titicaca water frog lives solely in the depths of Lake Titicaca in the Andes mountains at elevations of 3,810 metres (12,500 feet). Its copious skin folds allow it to breathe — through cutaneous respiration (skin breathing) — at such high altitudes, its lungs are only 1/3 the size they should be.

The Amazon milk frog isn't named for its milky white appearance, instead, its name refers to a poisonous milky substance that it secretes when threatened. It also uses the fluid as "sunscreen" — lathering it over its body to prevent itself from drying out in the sun.