A group of frogs are called an army.
The largest frog in the world is the Goliath Frog: He has a body length of 13 inches and if you count the outstretched hind legs, you get an impressive size of 31 inches. The smallest frog, Paedophryne amanuensis, measures merely 8 mm snout to vent. Three of those would fit comfortably on the eye of a goliath frog. Frogs can only perceive movements; if an insect does not move, they cannot see it. Frogs sometimes eat so many fireflies that you can see them glowing in the dark.
Frogs close their eyes when they eat, as they help them to swallow. The eyes sink into the skull and push the food into their throat. They can swallow with their eyes open, but that takes much longer. For a long time, scientist believed that frogs are unable to throw up. They have been proven otherwise by an unfortunate frog during a space mission. The amphibian will throw up their stomach, use their hands to clean out the content and then swallow it back down. Not a pretty sight.
Although frogs and toads look similar at first glance, there are a few key differences between the animals: Toads have short tongues, a bumpy skin and cannot jump. More people have phobias of frogs than of rats. In the rainforest, there are so-called glass frog who have a completely transparent belly. Japanese scientists have created genetically modified, transparent frogs for the laboratory based on them.