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Red marks indicate bones which have been substantially elongated in frogs and joints which have become mobile. Blue indicates joints and bones which have not been modified or only somewhat elongated. Frogs have no tail, except as larvae, and most have long hind legs, elongated ankle bones, webbed toes, no claws, large eyes, and a smooth or ...
The third is constructed by digging a new pool roughly 1 m (3 ft) wide and 10 cm (4 in) deep, sometimes moving quite large stones in the process. This may partially explain the goliath frog's large size, as larger frogs may be more successful at moving heavy objects when constructing their nests.
X-ray of a single, large bladder stone in a dog with a bladder located more to the rear than is usual X-ray of bladder stones in a dog X-ray of a struvite bladder stone in a cat. Bladder stones or uroliths are a common occurrence in animals, especially in domestic animals such as dogs and cats. [1] Occurrence in other species, including ...
Bladder stones vary in their size, shape and texture- some are small, hard and smooth whereas others are huge, spiked and very soft. One can have one or multiple stones. Bladder stones are somewhat more common in men who have prostate enlargement. The large prostate presses on the urethra and makes it difficult to pass urine. Over time ...
Individuals have also been found in crevices in spray-drenched cliff walls near waterfalls. During winter, individuals are less active, especially inland, and appear to retreat beneath large logs and boulders. Tadpoles require cool streams with smooth-surfaced stones with a minimum diameter of 55 mm (2.2 in).
Femoral glands in mantelline frogs are used by males for secreting chemical compounds important in territory marking and attracting mates. [4] Some of these chemicals display double bond isomerism, meaning the molecules, while similar in composition, differ in the arrangement of their double bonds.
Paleontologists have discovered a previously unknown ancient species: Kermitops — an amphibian that predates the dinosaurs and reveals the complexity of frog evolution. Researchers found a tiny ...
Their kidneys (metanephros) and large intestines are also well-suited to water retention. Most mammals do not lay eggs, but corresponding structures develop inside the placenta. The ancestors of true amniotes, such as Casineria kiddi, which lived about 340 million years ago, evolved from amphibian reptiliomorphs and resembled small lizards.