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Brazilian horned frog or Wied's frog: Brazil. Ceratophrys calcarata Boulenger, 1890: Colombian horned frog: Colombia and Venezuela Ceratophrys cornuta (Linnaeus, 1758) Surinam horned frog: northern part of South America Ceratophrys cranwelli Barrio, 1980: Cranwell's horned frog: Gran Chaco region of Argentina, Bolivia, Paraguay and Brazil.
Frogs are used for dissections in high school and university anatomy classes, often first being injected with coloured substances to enhance contrasts among the biological systems. This practice is declining due to animal welfare concerns, and "digital frogs" are now available for virtual dissection. [222]
Giant salamanders of the genus Andrias, as well as Ceratophrine and Pyxicephalus frogs possess sharp teeth and are capable of drawing blood with a defensive bite. The blackbelly salamander ( Desmognathus quadramaculatus ) can bite an attacking common garter snake ( Thamnophis sirtalis ) two or three times its size on the head and often manages ...
The African clawed frog (Xenopus laevis), also known as simply xenopus, African clawed toad, African claw-toed frog or the platanna) is a species of African aquatic frog of the family Pipidae. Its name is derived from the short black claws on its feet. The word Xenopus means 'strange foot' and laevis means 'smooth'.
A frog's ear drum works in very much the same way as does a human eardrum. It is a membrane that is stretched across a ring of cartilage like a snare drum that vibrates. Crossing the middle ear chamber there is an ossicle called the columella that is connected to the tympanum, and another ossicle, the operculum, that connects this to the oval ...
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 amount of entrained water the frog can ingest is related to its ability to actively increase its body volume. The frog's buccopharyngeal cavity (the cavity connecting the mouth and the pharynx) is very distensible and can expand substantially. It uses its entire trunk to rapidly enlarge the cavity, which expands into the lower end of the trunk.
The Iberian frog is endemic to Portugal and north-western and central Spain. It is a mountain species and has been recorded at altitudes up to 2,425 m (7,956 ft). [1] It is present in the northern half of Portugal and in Spain it is found in the region of Galicia, in west León and in north-west Zamora, with separate populations in mountainous regions in central Spain.
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