Frog Definition | Characteristics & Facts



Frog Definition

It is defined as a tailless amphibian belonging to the order Anura. These creatures are well-known for their unique life cycle, which involves undergoing a metamorphosis from a tadpole (a larval stage with a tail) into an adult frog. Frogs are found in a variety of habitats worldwide, including ponds, swamps, lakes, rivers, and even in some arid regions.

Frog General Characteristics & Facts


Frogs belong to the class Amphibia, which means they are cold-blooded vertebrates that spend part of their lives in water (during their tadpole stage) and part on land (as adult frogs).

Size and Shape

Frogs come in various sizes, ranging from a few millimeters in the case of the smallest species to over a foot long in some larger ones. They have a distinctive body shape with a head, trunk, limbs, and typically a tail during their tadpole stage.


Frogs have moist, permeable skin without scales. Their skin is highly sensitive and helps with respiration, as well as absorbing water and some nutrients.


Frogs have four limbs, with the hind legs being much larger and more muscular than the front legs. These hind legs are specialized for jumping and powerful swimming.

Eyes and Visibon

Their large, bulging eyes provide excellent vision. While their eyes can’t move in their sockets, frogs can swivel their heads to change their field of view.


Frogs have a well-developed sense of hearing, with a circular eardrum, or tympanum, located just behind each eye.

Breeding and Reproduction

Most frogs reproduce through external fertilization. During mating, the male grasps the female from behind (amplexus), and she releases eggs, which the male fertilizes with his sperm. These eggs are then typically laid in water, where they hatch into tadpoles.

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Physical Characteristics Frog

  1. Moist, Permeable Skin: Frogs have smooth, thin, and moist skin without scales. Their skin is permeable, meaning they can absorb water and even oxygen through it. This adaptation allows them to breathe through their skin in addition to their lungs.
  2. Body Shape: Frogs have an elongated body with a distinct head, trunk, and limbs. The body shape may vary depending on the species, but it generally allows for efficient movement both on land and in water.
  3. Limbs: Frogs have four limbs, with the front limbs shorter and less muscular than the hind limbs. The hind limbs are specialized for jumping and are responsible for the frog’s incredible leaping abilities.
  4. Eyes: Frogs have large, bulging eyes positioned on the top of their head, providing them with excellent all-around vision. Their eyes are also adapted to see well in dim light.
  5. Tympanum (Eardrum): Located behind each eye, the tympanum is a circular membrane that functions as the frog’s eardrum. It allows them to hear sounds and communicate with other frogs.
  6. Nictitating Membrane: Frogs have a transparent, protective inner eyelid called the nictitating membrane that covers and protects their eyes while underwater.
  7. Tongue: Frogs have a long, sticky tongue attached to the front of their mouth. They use this tongue to rapidly shoot out and catch insects and other small prey.
  8. Teeth: Most frogs lack teeth, but they have small, bony projections on the upper jaw called maxillary teeth. These teeth are used to hold onto prey before swallowing it whole.
  9. No Tail (as adults): Adult frogs typically do not have a tail, but they do have a tail during their tadpole stage. As they undergo metamorphosis, the tail is absorbed, and they become tailless adults.
  10. Coloration and Camouflage: Frog coloration and patterns vary widely among species. Some frogs have bright, contrasting colors to warn predators of their toxicity, while others have camouflage patterns to blend in with their surroundings and avoid detection.
  11. Hind Feet: The hind feet of frogs are webbed, which aids in swimming and provides better propulsion in water.
  12. Respiratory Adaptations: Frogs have a unique respiratory system that allows them to breathe both in water and air. They can use their lungs on land and their skin for respiration while in water.
  13. Vocal Sac: Many male frogs have vocal sacs, which are flexible, inflatable pouches located beneath their mouth. These vocal sacs are used to amplify their calls during mating and territorial displays.

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Scientific Classification of Frog

  • Kingdom: Animalia
  • Phylum: Chordata
  • Subphylum: Vertebrata
  • Class: Amphibia
  • Order: Anura
  • Family: Ranidae
  • Genus: Rana

Key locations of Frog

  • South America
  • North America
  • Europe
  • Africa
  • Asia
  • Australia
  • Central America
  • Caribbean Islands
  • Amazon Rainforest
  • Everglades (Florida, USA)
  • Western Ghats (India)
  • Madagascar
  • Borneo
  • Papua New Guinea
  • Andes Mountains
  • Costa Rica
  • Indonesia
  • Brazil
  • Australia’s Northern Territory
  • Japan

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Frog FAQs

What does Frog eat?

  • Insects
  • Spiders
  • Worms
  • Snails and Slugs
  • Small Fish
  • Small Mammals and Other Amphibians
  • Crustaceans and Small Aquatic Creatures
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