In West Africa, the goliath frog is known for being the largest frog in the world, with some individuals growing up to 15 inches in length and weighing as much as 7 pounds. One of the most unique features of this frog is the vocal sacs found on male frogs. These pouches of skin fill with air and resonate sounds like a megaphone, allowing male frogs to produce loud calls that can be heard from miles away.
On the other hand, in eastern Papua New Guinea, the Paedophryne amauensis frog holds the record for being the smallest frog in the world, measuring only 7mm (0.27 inches) long. This tiny frog has bright colors that serve as a warning to predators about its toxic skin. Some poisonous frogs, such as the golden poison dart frog and dyeing poison dart frog, have bold and bright colors to warn predators about their toxic skins.
In extreme cold environments like the Arctic circle, a wood frog has a unique adaptation that allows it to survive. This frog can live with 65% of its body frozen due to glucose in its blood acting as antifreeze that protects its vital organs from damage. Thanks to this adaptation, wood frogs can survive freezing temperatures for extended periods.