True frog

Cyprus water frog (Pelophylax cypriensis)

Rana ishikawae

Rana curtipes

True frogs are a group of amphibians that belong to the family Ranidae. This family is one of the most diverse and widely distributed of all the frog families, and its members are found on every continent except Antarctica. True frogs are characterized by their smooth or slightly granular skin, long legs, and the presence of a tympanum (an external hearing structure) that is typically visible. They are known for their powerful leaps and the aquatic or semi-aquatic nature of many species within the family.

Description

True frogs vary greatly in size, from the tiny 10 mm (0.39 in) adult of the species Microhyla nepenthicola, one of the world's smallest frogs, to the large Goliath frog (Conraua goliath), which can grow up to 32 cm (12.6 in) in length and weigh up to 3.25 kg (7.17 lb). Their skin color can be vibrant and varied, often serving as camouflage that helps them blend into their surroundings.

Habitat and Distribution

True frogs inhabit a wide range of environments, from tropical rainforests to arid deserts, and from lowland ponds and streams to high-altitude lakes. They are most abundant in warm, moist, tropical regions but can also be found in temperate zones. The adaptability of true frogs to different habitats is a key factor in their widespread distribution.

Behavior and Ecology

The diet of true frogs primarily consists of insects and other small invertebrates, but larger species may consume small mammals, reptiles, and other amphibians. True frogs are generally nocturnal, although some species are active during the day. They are also known for their breeding calls, which males use to attract females. The calls vary widely among species, from simple croaks to complex and melodious sounds.

Breeding habits vary among true frogs. Many species lay their eggs in water, where they develop into aquatic larvae, or tadpoles, before undergoing metamorphosis into adult frogs. Other species exhibit more unique reproductive strategies, such as laying eggs on land or in tree holes, where the developing tadpoles are less vulnerable to aquatic predators.

Conservation

Many species of true frogs are threatened by habitat loss, pollution, climate change, and diseases such as chytridiomycosis, which is caused by the fungus Batrachochytrium dendrobatidis. Conservation efforts for true frogs include habitat protection, captive breeding programs, and research into disease management and mitigation.

Classification

The family Ranidae, to which true frogs belong, is part of the order Anura, which encompasses all frogs and toads. Within Ranidae, there are numerous genera and species, reflecting the family's diversity. Taxonomic classification of true frogs is an ongoing process, with genetic studies often leading to revisions in the understanding of relationships among species.

See Also

• Amphibian
• Metamorphosis
• Chytridiomycosis
• Goliath frog
• Microhyla nepenthicola