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A few species deposit eggs on land or bypass the tadpole stage. Adult frogs generally have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on plant matter. Frog skin has a rich microbiome which is important to their health. Frogs are extremely efficient at converting what they eat into body mass.
Some arboreal frogs reduce water loss by having a waterproof layer of skin, and several South American species coat their skin with a waxy secretion. Other frogs have adopted behaviours to conserve water, including becoming nocturnal and resting in a water-conserving position. Some frogs may also rest in large groups with each frog pressed ...
If the frog's skin simply reflects visible green light, then green frogs on green leaves can still be spotted by these particular predators. Therefore, when the environment also reflects infrared light, H. fleischmanni can hind into the background even if the predators have such infrared receptors.
A true endoskeleton is derived from mesodermal tissue. In three phyla of animals, Chordata, Echinodermata and Porifera (), endoskeletons of various complexity are found.An endoskeleton may function purely for structural support (as in the case of Porifera), but often also serves as an attachment site for muscles and a mechanism for transmitting muscular forces as in chordates and echinoderms ...
Male Rana temporaria calling in a garden pond in Jambes, Belgium. The common frog or grass frog (Rana temporaria), also known as the European common frog, European common brown frog, European grass frog, European Holarctic true frog, European pond frog or European brown frog, is a semi-aquatic amphibian of the family Ranidae, found throughout much of Europe as far north as Scandinavia and as ...
The supratympanic fold is moderate. Skin is dorsally smooth and ventrally weakly areolate. The arms are short and slender, whereas the hind limbs are long and slender. The fingers and toes bear discs and have some webbing (more so in the female). In preserved specimens, dorsal ground color is tan, brown, or gray. Males have some black specks. [3]
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 ...
Adults can grow to 25 mm (1.0 in) in snout–vent length. The head is as wide as the body or narrower. Dorsal skin has many granules and tubercles. There is a conspicuous W-shaped suprascapular fold. The finger and toe discs are small. Coloration is dark brown or greenish brown, either relatively uniform or with irregular spots.