Frogs are amphibians Amphibians , such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land vertebrates (amniotes), amphibians lay in the order Anura (meaning "tail-less", from Greek an-, without + oura, tail), formerly referred to as Salientia (Latin salere (salio), "to jump"). Most frogs are characterized by long hind legs, a short body, webbed digits (fingers or toes), protruding eyes Eyes are organs that detect light, and send electrical impulses along the optic nerve to the visual and other areas of the brain. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, and the absence of a tail The tail is the section at the rear end of an animal's body; in general, the term refers to a distinct, flexible appendage to the torso. It is the part of the body that corresponds roughly to the sacrum and coccyx in mammals and birds. While tails are primarily a feature of vertebrates, some invertebrates—including scorpions and springtails—. Frogs are widely known as exceptional jumpers, and many of the anatomical characteristics of frogs, particularly their long, powerful legs, are adaptations to improve jumping performance. Due to their permeable skin, frogs are often semi-aquatic or inhabit humid areas, but move easily on land. They typically lay their eggs In most birds and reptiles, an egg is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo. When the embryo is adequately developed it breaks out of the egg in the process of hatching. Some embryos have a temporary in puddles, ponds A pond is an inland body of standing water, either natural or man-made, that is usually smaller than a lake. A wide variety of man-made bodies of water are classified as ponds, including water gardens designed for aesthetic ornamentation, fish ponds designed for commercial fish breeding, and solar ponds designed to store thermal energy or lakes A lake is a terrain feature (or physical feature), a body of liquid on the surface of a world that is localized to the bottom of basin (another type of landform or terrain feature; that is, it is not global) and moves slowly if it moves at all. Another definition is, a body of fresh or salt water of considerable size that is surrounded by land. On, and their larvae A larva is a young (juvenile) form of animal with indirect development, going through or undergoing metamorphosis (for example, insects, amphibians, or cnidarians), called tadpoles A tadpole, polliwog , or pollywiggle (also polliwiggle, polwiggle, or porwiggle) is the wholly aquatic larval stage in the life cycle of an amphibian, particularly of an anuran, have gills A gill is an anatomical structure found in many aquatic organisms. It is a respiration organ whose function is the extraction of oxygen from water and the excretion of carbon dioxide. The microscopic structure of a gill is such that it presents a very large surface area to the external environment and develop in water Water is a ubiquitous chemical substance that is composed of hydrogen and oxygen and is essential for all known forms of life. Adult frogs follow a carnivorous A carnivore , meaning 'meat eater' (Latin carne meaning 'flesh' and vorare meaning 'to devour'), is an animal that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of vertebrate and/or invertebrate animal tissue, whether through predation or scavenging. Animals that depend solely on animal flesh for their diet, mostly of arthropods An arthropod is an invertebrate animal having an exoskeleton , a segmented body, and jointed appendages. Arthropods are members of the Phylum Arthropoda (from Greek ἄρθρον arthron, "joint", and ποδός podos "foot", which together mean "jointed feet"), and include the insects, arachnids, crustaceans, and, annelids The annelids, collectively called Annelida , are a large phylum of segmented worms, with over 17,000 modern species including ragworms, earthworms and leeches. They are found in marine environments from tidal zones to hydrothermal vents, in freshwater, and in moist terrestrial environments. Although most textbooks still use the traditional and gastropods The class Gastropoda or gastropods form a major part of the phylum Mollusca. Gastropods are more commonly known as snails and slugs. Frogs are most noticeable by their call, which can be widely heard during the night or day, mainly in their mating season The estrous cycle comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females. Humans undergo a menstrual cycle instead. Estrous cycles start after puberty in sexually mature females and are interrupted by anestrous phases or pregnancies. Typically estrous cycles continue until death.

The distribution of frogs ranges from tropic The tropics, seated in the equatorial regions of the world, are limited in latitude by the Tropic of Cancer in the northern hemisphere at approximately 23°26' N latitude and the Tropic of Capricorn in the southern hemisphere at 23°26' (23.4°) S latitude. The tropics are also referred to as the tropical zone and the torrid zone (see geographical to subarctic The Subarctic is a region in the Northern Hemisphere immediately south of the true Arctic and covering much of Alaska, Canada, southern Greenland, the north of Scandinavia, Siberia, northern Mongolia and the Chinese province of Heilongjiang. Generally, subarctic regions fall between 50°N and 70°N latitude, depending on local climates regions, but most species are found in tropical rainforests A tropical rainforest is an ecosystem usually found around the equator. They are common in Asia, Australia, Africa, South America, Central America, Mexico and on many of the Pacific Islands. Within the World Wildlife Fund's biome classification, tropical rainforests are considered a type of tropical wet forest and may also be referred to as. Consisting of more than 5,000 species described, they are among the most diverse groups of vertebrates Vertebrates are members of the subphylum Vertebrata, chordates with backbones or spinal columns. About 58,000 species of vertebrates have been described. Vertebrata is the largest subphylum of chordates, and contains many familiar groups of large land animals. Vertebrates comprise cyclostomes, bony fish, sharks and rays, amphibians, reptiles,. However, populations of certain frog species are declining Dramatic declines in amphibian populations, including population crashes and mass localized extinctions, have been noted since the 1980s from locations all over the world. These declines are perceived as one of the most critical threats to global biodiversity, and several causes are believed to be involved, including disease, habitat destruction significantly.

A distinction is often made between frogs and toads A toad can refer to a number of species of amphibians in the order Anura. A distinction is often made between frogs and toads by their appearance, prompted by the convergent adaptation among so-called "toads" to dry habitats. Many "toads" have leathery skin for better water retention, and brown coloration for camouflage. They on the basis of their appearance, caused by the convergent adaptation The wing is a classic example of convergent evolution in action. Although their last common ancestor did not have wings, birds and bats do, and are capable of powered flight. The wings are similar in construction, due to the physical constraints imposed upon wing shape. Similarity can also be explained by shared ancestry, as evolution can only among so-called toads to dry environments; however, this distinction has no taxonomic basis. The only family exclusively given the common name "toad" is Bufonidae Bufonidae is the family of the true toads, members of the order Anura . They are the only family of anurans all members of which are known as "toads". The bufonids now comprise more than 35 genera, Bufo being the most widespread and well known, but many species from other families are also called "toads," and the species within the toad genus Atelopus Atelopus is a large genus of true toads natively distributed in Costa Rica to Bolivia and French Guiana. Atelopus are generally brightly colored and diurnal. Most species are associated with mid- to high-elevation streams. This genus has been greatly affected by amphibian declines, and many species are now considered endangered, while others are referred to as "harlequin frogs".

The name frog derives from Old English Old English , also called Anglo-Saxon, is an early form of the English language that was spoken and written in parts of what are now England and south-eastern Scotland between at least the mid-5th century and the mid-12th century. What survives through writing represents primarily the literary register of Anglo-Saxon. It is a West Germanic frogga, (compare Old Norse Old Norse is a North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during the Viking Age, until about 1300 frauki, German German (Deutsch, [ˈdɔʏtʃ] ) is a West Germanic language, thus related to and classified alongside English and Dutch. It is one of the world's major languages and the most widely spoken first language in the European Union. Around the world, German is spoken by approximately 105 million native speakers and also by about 80 million non-native Frosch, older Dutch Dutch ( Nederlands ) is a West Germanic language spoken by over 22 million people as a native language, and over 5 million people as a second language. Most native speakers live in the Netherlands, Belgium, and Suriname, with smaller groups of speakers in parts of France, Germany and several former Dutch colonies. It is closely related to other spelling kikvorsch), cognate with Sanskrit Sanskrit is a historical Indo-Aryan language, one of the liturgical languages of Hinduism and Buddhism, and one of the 22 official languages of India. It is also declared as a Classical Language of India along with Tamil, Telugu and Kannada plava (frog), probably deriving from Proto-Indo-European The Proto-Indo-European language is the unattested, reconstructed common ancestor of the Indo-European languages, spoken by the Proto-Indo-Europeans. The existence of such a language has been accepted by linguists for over a century, and there have been many attempts at reconstruction. Nevertheless, many disagreements and uncertainties remain praw = "to jump".^[1]

Show All>>

See Also:

• Anura

What Links Here:

• Home

Most Popular Pages:

• Bufo: Answers
• Frutas
• Anura: Web Search
• Kami
• Sumatra Toad
• Leptophryne: Blogs
• Outros
• Convergent Evolution: Encyclopedia
• Heraldo
• Anfibios: Blogs

Related 'Anura' Searches: