In both mammalian and amphibian eggs, integrins have been proposed as putative sperm receptors.
In addition to ecological studies investigating the timing of amphibian metamorphosis, a considerable amount of work has addressed the endocrine control of metamorphosis.
Perhaps 10 to 30 percent of Earth's mammal, bird, and amphibian species are facing extinction.
Unfortunately for them, in December of 1941 the company was also given the go-ahead to develop an amphibian .
One of the most urgent problems in conservation biology today is the continuing loss of amphibian populations on a global scale.
It says no other road-legal amphibian has managed to exceed 6mph on water.
In dry years, such as the year of this study, ponds were dry by mid-June, invertebrate and amphibian larvae were unable to develop enough to metamorphose and emerge from the water.
Many other types of animals - both amphibians and reptiles - shared the Triassic world.
Secondarily aquatic adult amphibians provide another source of diversity.
Among vertebrates, newts and other urodele amphibians show a remarkable capacity for regeneration.