Anura (Frogs and Toads)
2700 species of frogs exist in the world. According to the United States
Biological Survey, 95 species of frogs are in North America, including
21 species of toads. To see all their names and learn more about them,
- The smallest frog
in the world is probably Psyllophryne didactyla, found in Brazil.
Adults are only about 9.8mm.
- The largest frog
in the world is probably the Goliath Frog, from West Africa, which is
30 cm in length.
- Some frogs can
leap 20 times their body length in a single hop.
- Most swimming frogs
have webs on their rear toes.
- Most frogs that
live on trees or other plants have sticky pads on the ends of their
toes that help them cling.
- The bulging eyes
of frogs allow them to see in many directions--above, below, in front,
and to the sides--all at the same time.
- Almost all frogs
eat little but invertebrate animals.
- Male frogs are
smaller than females, but have bigger, stronger front feet.
- Frogs usually lay
their eggs in big masses.
- Many frogs have
poison glands in their skin.
- Some frogs change
the color of their skin with changes in light, temperature, or humidity.
- Many frogs shed
their skin several times a year. They pull off the old skin with their
legs, and usually eat the old skin.
- Frogs produce sound
with their vocal cords, inside their larynx, the same as us! Many frogs
have a vocal sac or sacs which swell when they call. Frogs can have
one vocal sac on their throat, or two, on either side of the head. The
vocal sacs make the calls louder.
- When frogs hibernate,
they breathe through their skin!
- Bullfrogs may live
to be 15 years old in captivity.
- Frogs catch their
food by flipping their sticky tongue out. Most frogs have teeth in their
- Most frogs are
slender with long back legs.
- Some kinds of frogs
live in water their whole lives. All need moisture, and most live near
water as adults.
- People sometimes
eat frog legs. The species people usually eat in North America are the
Leopard Frog, Bullfrog, and Green Frog.