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A fully distended vocal sac in an Australian red-eyed tree frog (Litoria chloris) Italian tree frog (Hyla intermedia) with an inflated vocal sac. The vocal sac is the flexible membrane of skin possessed by most male frogs and toads. The purpose of the vocal sac is usually as an amplification of their mating or advertisement call.
An adult frog has a stout body, protruding eyes, anteriorly-attached tongue, limbs folded underneath, and no tail (the tail of tailed frogs is an extension of the male cloaca). Frogs have glandular skin, with secretions ranging from distasteful to toxic.
Nuptial pad (arrow) on thumb of Pelophylax esculentus. A nuptial pad (also known as thumb pad, or nuptial excrescence [1]) is a secondary sex characteristic present on some mature male frogs and salamanders.
Darwin's frog has an unusual method of brooding, in which the male will facilitate development of its tadpoles inside its vocal sac. This male brooding may make Darwin's frog unique among extant frog species, as the only other frog that has this behavior is the R. rufum , which may be extinct.
This finding refutes previous claims that a male frog will clasp any proximate female with no regard to whether the female has consented. [32] [34] [35] [36] Once a male finds a receptive female he will clasp onto her and undergo amplexus—reproductive position—by utilization of the males' forelimbs. The enlargement of forelimb muscles is a ...
Male Dendropsophus microcephalus calling. Sexual selection in amphibians involves sexual selection processes in amphibians, including frogs, salamanders and newts.Prolonged breeders, the majority of frog species, have breeding seasons at regular intervals where male-male competition occurs with males arriving at the waters edge first in large number and producing a wide range of vocalizations ...
The hairy frog (Trichobatrachus robustus) also known as the horror frog or Wolverine frog, is a Central African species of frog in the family Arthroleptidae. It is typically considered monotypic within the genus Trichobatrachus , [ 2 ] but based on its genetics , it should be included in Astylosternus instead. [ 3 ]
In captivity, C. cranwelli and C. ornata are the most popular species, [4] along with the "fantasy frog", a captive-produced hybrid between C. cranwelli and C. cornuta.These frogs can live in a terrarium with a floor area 8-10 times the size of the frog. [4]