Frogs are amphibians noted for their ability to leap, make croaking sounds, have protruding eyes, and have slippery skin. They are found all over the world and are among the most varied creatures, with approximately 6,000 species. Frogs outnumber salamanders and caecilians, the two main families of amphibians. There are four major groups of frogs: anuran (frog), bufonidae (toothbufon), caymanan, and caiennian.
Anurans are the largest group, containing nearly 95% of all known frog species. They are characterized by a head without any appendages except for a small naked nose pit, large external ears, and webbed feet. The males usually have very colorful plumage. Bufonidae is another large family, with about 120 species in the New World. They look similar to anurans but have a beak-like mouthpart under the face instead of ears. Cayman Islands frogs are unique in that they lack legs and walk on thin stalks called trombones. They live on plants that grow in shallow water near the coast. Caenneries are smaller than other frogs but contain many endangered species. Their eggs are attached to vegetation above shallow waters and are guarded by predators. When danger approaches, the caenner drops into the water where it can escape unharmed.
Two characteristics of frogs that you should know are their powerful hind legs and their voices.
The frog's key amphibian qualities include the ability to breathe via its skin and lungs. Frogs have webbed feet, as do the majority of amphibians. To survive, frogs must dwell in damp settings. They absorb water through their skin and rely on their large internal organs to filter the water they consume.
Frogs are cold-blooded animals and so must stay near warm bodies of water such as springs or ponds for warmth. During cold weather, they enter a dormant stage called torpor in which body temperature drops to about 95 degrees F (35 degrees C). In warmer climates, they may only need to drop their temperature to 88 degrees F (31 degrees C). Scientists think this ability to adjust their body temperature helps frogs survive in a wide range of temperatures.
Frogs typically grow to be about 1 meter long (3 feet), but there are species that can reach 2 meters (6 feet). Their heaviest weight ever recorded was 140 pounds (64 kg). Females usually carry their eggs until they hatch into tadpoles, which means that females must remain close to suitable breeding habitats.
Frogs produce toxic chemicals during battle or when threatened. These chemicals can kill other animals and humans who might come into contact with them.
The absence of a tail in adulthood separates frogs and toads from other amphibians. In addition, frogs and toads have substantially longer rear legs than other amphibians. Their back legs have been modified to allow them to leap. Frogs spend more time in water, whereas toads spend more time on land. This is because frogs need to absorb oxygen from the water they live in while toads need only to protect themselves from the sun's heat.
Frogs are classified into three groups based on their diet: herbivores, carnivores, and omnivores. Herbivores eat plants and are well suited for living in lush forests where many kinds of plants grow. Carnivores eat animals such as insects and other reptiles. Omnivores can eat both plants and meat. Most frogs are either herbivores or carnivores. However, a few species are omnivorous.
Frogs are important to humans because we enjoy watching them swim about our ponds and lakes or hop across our gardens. However, some frogs are endangered because people like to use them for entertainment (such as drinking games) without considering how removing these animals from their natural habitat affects them.
Frogs' skin is very sensitive to moisture and dry conditions, so they must stay hydrated at all times. They get this needed liquid also through eating vegetables with high water content such as tomatoes, cucumbers, and melons.
Frogs have prominent eyes, no tail, and powerful, webbed hind feet designed for leaping and swimming. They also have soft, moist skin. Many are aquatic in nature, but some live on land, in burrows, or in trees. There are over 900 species of frogs in 80 families worldwide.
They get their name from a sound that they make by snapping their jaws together. This sound is how scientists identify each species of frog. Each species has its own unique call to find mates or to warn off potential predators. Some species' calls are pleasant songs that can be heard by humans.
Frogs are amphibians. Amphi means "both land and water", and frogs are the only animals that can breathe both underwater and out on land. They use their lungs to breathe underwater but have gills at the base of their throats that they can use when out of water. Humans can learn something about our planet's environment from studying these amphibians! Frogs are very sensitive to air pollution and industrial chemicals that we are exposed to every day. They suffer from the same diseases that humans do, such as cancer, and some species have been affected by virus infections that cause fever, arthritis, and encephalitis (swelling of the brain).
Frogs come in many different colors. Some species are green or blue with yellow, white, or black markings.
They have lungs for breathing on land and an unique skin for breathing in water. Salamanders are frogs. This implies they can survive on land as well as in water.
Frogs absorb oxygen through their skin and then transport it to their organs where it is absorbed into the blood stream. They do this by using special cells called "keratocytes" which are found in their skin. These cells contain many small air sacs that extend into the skin. When oxygen is needed, these cells squeeze together, increasing their density until they block some of the capillaries that feed the tissue below them. This prevents oxygen from reaching those tissues while at the same time allowing carbon dioxide to escape. The result is breathlessness or asphyxiation for the frog.
When salamanders go underwater, they lose the use of their limbs due to lack of blood flow. However, when they return to dry land, they grow new limbs through a process called "tritony". Salamanders will never regain their lost limbs once they go dry again. However, new limbs will grow in their place if they remain submerged for a long period of time.