Search results
Results from the WOW.Com Content Network
The oldest fossil "proto-frog" Triadobatrachus is known from the Early Triassic of Madagascar (250 million years ago), but molecular clock dating suggests their split from other amphibians may extend further back to the Permian, 265 million years ago. Frogs are widely distributed, ranging from the tropics to subarctic regions, but the greatest ...
This frog lives in fast-flowing streams and internal fertilisation prevents the sperm from being washed away before fertilisation occurs. [90] The sperm may be retained in storage tubes attached to the oviduct until the following spring. [91] Most frogs can be classified as either prolonged or explosive breeders.
The archaeobatrachians are the most primitive of frogs. These frogs have morphological characteristics which are found mostly in extinct frogs, and are absent in most of the modern frog species. Most of these characteristics are not common between all the families of Archaeobatrachia, or are not absent from all the modern species of frogs.
The frogs are large, have powerful leaps, and inevitably escape after which they may wreak havoc among the native frog population. [49] Countries that export bullfrog legs include the Netherlands, Belgium, Mexico, Bangladesh, Japan, China, Taiwan, and Indonesia. Most of these frogs are caught in the wild, but some are raised in captivity.
The common frog (Rana temporaria) is also similar in appearance but it has a less rounded snout, damp smooth skin, and usually moves by leaping. [18] Common toads can live for many years and have survived for fifty years in captivity. [19] In the wild, common toads are thought to live for about ten to twelve years.
The American green tree frog is moderately sized. It has long legs, a streamlined and slender build, and smooth skin. The American green tree frog ranges from 3.2 to 6.4 centimetres (1 + 1 ⁄ 4 to 2 + 1 ⁄ 2 in) in length. For perspective on the growth of juveniles, recently metamorphosed "young-of-the-year" were found to be about 20.6 mm. [10]
Rana (derived from Latin rana, meaning 'frog') is a genus of frogs commonly known as the Holarctic true frogs, pond frogs or brown frogs. Members of this genus are found through much of Eurasia and western North America .
The lifespan of the Fletcher's frog is estimated to be less than 2 years, which is significantly shorter than the average temperate zone anuran lifespan of 4-6 years. Recapture data suggests that nearly all breeding adults do not survival before the start of a new mating season, meaning that the breeding population is almost completely replaced ...