For many people, frogs have many different meanings. But whether you like it or hate it, it's hard to ignore its existence.
From their eyeball swallowing to giving birth to live tadpoles, here are some strange facts about frogs that you may not know.
<h1 class="pgc-h-arrow-right" data-track="34" > swallowed with the help of the eyelids</h1>
You may have heard the saying that "eyes are bigger than stomachs", but sometimes, big eyes come in handy, and many frogs use their eyeballs to swallow things. Christopher Raxworthy, a herpetologist at the American Museum of Natural History, said: "Once prey gets into a frog's mouth, they pull their eyeballs down to help them get into their throats." ”
Glass frog
<h1 class="pgc-h-arrow-right" data-track="5" > is not oviparous</h1>
Most frogs reproduce by laying eggs, then hatching into tadpoles and finally developing into adult frogs. But there are also a few frogs that are born in vitro. Usually, young frogs are called baby frogs. But a recent study described an Indonesian poison-toothed frog capable of laying live tadpoles.
Indonesian poison-toothed frog
<h1 class="pgc-h-arrow-right" data-track="10" > give birth from the female frog</h1>
A frog called the stomach frog (belonging to the genus Froglet) has an unusual party trick. In both types of Australian frogs, the female lays eggs normally, and the male places sperm on the egg to fertilize the egg.
But then things got a little weird: the female frog would swallow the fertilized egg, her body would shut down the digestive enzymes in the stomach, and the egg would develop into a small frog in the stomach. Finally, the mother frog gave birth to a small tadpole from its mouth. Sadly, there are only two species of this frog: the gastric brook toad and the hatching brook toad. They became extinct in the mid-1980s, probably because of wood cutting in the areas where they lived, as well as infections caused by chytridium.
Stomach brooding frogs
<h1 class="pgc-h-arrow-right" data-track="16" > an unusual hatching habit</h1>
A frog known as the common Surinamese toad, also known as the possum toad, commonly known as the pipa toad, is one of the strangest and most disgusting frogs in the world. The flat shape of the animal makes it look a bit like pancakes, and it has lived in water all its life. When the male and female mate, the female releases its eggs and the male captures and fertilizes them. The eggs are then embedded in the sponge tissue on the back of the female toad, which grows on the egg. When the little tadpoles grow into small frogs, they will jump out of their mother's back.
Surinamese toad
<h1 class="pgc-h-arrow-right" data-track="17" > oversized frog</h1>
The largest frog in the world is the giant frog in West Africa, which can grow up to 15 inches (about 38 centimeters) and weigh up to 7 pounds (about 3.2 kilograms).
African giant frog
<h1 class="pgc-h-arrow-right" data-track="27" > pregnancy test</h1>
In the 1940s, scientists discovered that the African clawed frog can be used to determine whether a woman is pregnant. When hormones in the pregnant woman's urine are injected into the frog, the frog lays eggs. Between the 1940s and 1970s, hospitals introduced a large number of African clawed frogs. Toads from the genus Toad were also used, which led to the emergence of a new medical term "toad test". (Modern pregnancy tests no longer require frogs or toads.) )
African clawed frog