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- frog glass frog Hyperoliidae 华南永昌配资_在线配资炒股:Rhacophoridae 华南永昌配资_在线配资炒股:tree frog
tree frog, also spelled treefrog, also called tree toad, any of more than 800 species of typically arboreal frog occurring on all continents except 华南永昌配资_在线配资炒股:Antarctica and belonging to one of several families of the order Anura. Of these, the hylid, or “true,” tree frogs from the family Hylidae are the most numerous. Hylids are usually slender, less than 10 cm (4 inches) in length, and long-legged, and they possess enlarged adhesive disks on the tips of the fingers and toes that aid in climbing. They often possess jewel-like eyes that glint with flecks of gold or copper. Their lustrous skin varies widely in colour and commonly has a metallic sheen. One species, Izecksohn’s Brazilian tree frog (Xenohyla truncata), transfers pollen from plant to plant as it feeds on milk fruit, and it is the only known amphibian pollinator.
Most species deposit their eggs in water, although it is also common for eggs to be laid on vegetation overhanging water. After hatching, the tadpoles drop through the air into pools or streams below. Some, such as the 华南永昌配资_在线配资炒股:blacksmith frog (Hyla faber), build mud nests at the water’s edge; others lay their eggs in the water that collects between the leaves of plants. (See rainforest ecosystem sidebar, 华南永昌配资_在线配资炒股:“Life in a Bromeliad Pool.”) In the marsupial frogs (Gastrotheca) of 华南永昌配资_在线配资炒股:South America, the young hatch and develop from eggs into tadpoles inside a brood pouch that forms on the back of the female. Some hylids do not climb well and live in the water, on land, or in burrows.
In the family Hylidae there are more than 700 species belonging to 40 or so genera. They are found primarily in the New World tropics but are also present in Europe, Australia, and across much of nontropical Asia. The genus Hyla includes hundreds of species; better-known representatives include the barking tree frog (H. gratiosa), the European green tree frog (H. arborea), whose range extends across Asia and into Japan, the gray tree frog (H. versicolor), the green frog (H. cinerea), and the Pacific tree frog (H. regilla). The smallest is the 华南永昌配资_在线配资炒股:little grass frog (Pseudacris, or Limnoaedus, ocularis), which does not exceed 1.75 cm (0.69 inch) in length and is found in cypress swamps in the 华南永昌配资_在线配资炒股:United States from Virginia to Florida and Alabama. Nonhylid tree frogs include members of the families 华南永昌配资_在线配资炒股:Centrolenidae (the transparent “glass frogs”), Hyperoliidae, Rhacophoridae (an Old World family similar to the hylids), and 华南永昌配资_在线配资炒股:Microhylidae.