Tree frog

A tree frog is any species of frog that lives in an arboreal state. This means they spend a major portion of their lifespan in trees.

They are usually found in trees or other high-growing vegetation. Most tree frogs do not normally descend to the ground. They typically only go down to mate and spawn. Some species even build foam nests on leaves. These frogs rarely leave the trees even as adults.

A few groups, like the genus Eleutherodactylus, have evolved direct development. This means they do not need water for a tadpole stage.

Tree frogs have developed special physical traits to survive in high plants. They are usually tiny so branches can carry their weight. While some reach 10 cm (4 in) or more, most are smaller. They are also typically more slender than terrestrial frogs.

Their fingers and toes have well-developed discs at the tips. These discs allow them to use several attachment mechanisms. They require different types of force to stay on branches. These include static and dynamic, adhesive and frictional, and reversible and repeatable forces. Their limbs tend to be small to improve grasping ability.

The genus Chiromantis is an extreme example of this. It can oppose two fingers to the other two. This creates a grip that works like a vise.

Many different lineages of frogs have become tree frogs. These frogs belong to the Neobatrachia suborder. However, they are not all closely related to each other. They have become similar through convergent evolution. This is a process where different species develop similar traits over millions of years.

This explains why they have similar morphology despite different origins. Some tree frogs live in seasonally arid environments. These frogs have adapted an extra-epidermal layer to survive. This layer is made of lipid and mucus. It is an evolutionary convergent response to dehydration stress.

There are several distinct families of tree frogs around the world. The Hylidae are known as the "true" treefrogs. They live in the Americas, Australia, and parts of Eurasia. The Rhacophoridae are known as shrub frogs. These are found in tropical regions near the Indian Ocean. This includes Africa, South Asia, and Southeast Asia.

They also occur in some parts of East Asia. Another group is the Centrolenidae, which are called glass frogs. These frogs are translucent and live in Central and South America. They may be closely related to the Hylidae.

Other families have unique homes and histories. The Hyperoliidae are known as reed frogs. These are small frogs native to sub-Saharan Africa. They are closely related to the burrowing Microhylidae. In Madagascar, there is a genus called Boophis. These are highly arboreal frogs. They evolved from the Mantellidae, which are toxic terrestrial frogs.

Each of these groups shows how frogs can adapt to different tropical and temperate zones.

Tree frogs are important for understanding how animals adapt to their environments. Their small size and specialized limbs allow them to occupy niches that other frogs cannot. Most terrestrial frogs are larger and heavier. Tree frogs must stay slender to live on thin twigs.

Their ability to generate adhesive and frictional forces is a key survival tool. Without these specialized discs, they could not stay in the canopy. Their specialized skin layers also show how they manage water loss. This allows them to live in places that are not always wet.

In summary, the tree frog is a successful example of biological adaptation. Whether they are glass frogs in South America or shrub frogs in Asia, they share similar needs. They must grip surfaces and manage moisture.

Through convergent evolution, many different types of frogs have found the same solutions. They have mastered the art of living high above the ground. This arboreal lifestyle defines their shape, their size, and their movement.