A group of birds is called a flock, a group of cattle is called a herd, but a group of frogs is called an army. (1)

There are over 7000 frog species in the world. (2, 9)

A frog completely sheds its skin about once a week. After it pulls off the old, dead skin, the frog usually eats it. (1)

Small frogs have the strongest jumping power in relation to their body size. For example, the Southern Cricket frog can jump 62 times its body length, approximately 6.4 feet (2 m), since they measure an average of 1.25 inches (3 cm). Compare this to the American Bullfrog, which can grow up to 8 inches (20.32 cm) in length and jump 7.4 feet (2.25 m) which is 11 times its body length. (3)

The South African sharp-nosed frog can jump 95 times its body length and holds the World Record for jumping an incredible 17.6 feet (5.36 m) high. Interestingly, if humans could do the same thing, they could jump 517 feet (157.6 m), almost one and a half football fields. (3)

The smallest frog in the world (about 7.7 mm long) is Paedophryne amauensis, from Papua New Guinea. They produce such a high-pitched noise that they sound can like insects, and they are one of the frog species that skip the tadpole stage, hatching right into miniature adults. They are also the smallest vertebrate on the planet! (2)

One way to tell a male frog from a female frog is by looking at its ears. The ears can be found right behind the frog’s eyes. If the ears are as big as the eyes, then the frog is a boy. If the ears are smaller than the frog’s eyes, then the frog is a girl. (4)

Frogs are amphibians, which comes from the Greek language and means "both lives." Most frogs are born in water as tadpoles and gradually change into frogs although some frogs, known as direct developers, are born as full frogs. This allows them to be born and live far away from water, such as on mountaintops. (5)

The world's largest frog is the Goliath Frog Conraua goliath, which lives in western Africa. They can grow to be over 30 cm (1 ft) long, and weigh over 3 kg (6.6 lbs - about as much as a newborn baby)! This species is endangered, due to conversion of rainforests into farmland, and due to their being used as a local food source. (2)

Frogs have both a common name and a scientific name, which is in Latin. Thus the African Clawed Frog is also known as Xenopus laevis. The scientific name consists of a frog's genus followed by its species (this is called binomial nomenclature). Carl Linnaeus devised this system in the 18th century so that scientists could be certain they were always referring to the correct species. For instance, there is a 'Green Treefrog' in Europe, America and Australia, but they are all different species: Hyla arborea, Hyla cinerea and Litoria caerulea. (2)

Frogs don’t drink water. Frogs have highly permeable skin, which allows them to breathe and absorb moisture from their surroundings. (6)

The wood frog of North America actually freezes in the winter and is reanimated in the spring. When temperatures fall, the wood frog’s body begins to shut down, and its breathing, heartbeat and muscle movements stop. The water in the frog’s cells freezes and is replaced with glucose and urea to keep cells from collapsing. When there’s a thaw, the frog’s warms up, its body functions resume and it hops off like nothing ever happened. (1)

Frogs are known as indicator species and can give scientists valuable insight into how an ecosystem is functioning. Because they are predators and prey many animals are affected by them, frogs provide insight into the health of the ecosystem. (5)

When a frog swallows its prey, it blinks, which pushes its eyeballs down on top of the mouth to help push the food down its throat. (1)

Some frogs remain in the tadpole stage for as long as 2 or 3 years!(2)

The Latin word for a frog (rana) comes from the imitation of a frog's croaking sound. (7)

The Moche people of ancient Peru worshipped animals, and often depicted frogs in their art. (8)

The tiny Coqui, which is smaller than a US penny, is believed to be the loudest frog in the world. The Coqui's call can reach 80 to 90 decibels. That's as loud as a chainsaw! (10, 13)

Coqui frogs are native to Puerto Rico, but they were accidentally introduced to Hawaii in the late 1980s. Without any natural predators there, the populations have grown significantly and changed Hawaiian ecosystems.(12)