Some resemble insects, while others look like crustaceans, amphibians, and sharks and move fluidly.
Over the next decade, the RETs wreaked havoc on the ecosystem, eating ducklings, small water birds, and other amphibians.
The Mllerian duct persists in its entirety in male amphibians, but only its upper end remains in male Selachians.
These amphibians are evidently the descendants of some of the fishes of the Devonian times.
These were marine animals of large size, but not fishes or amphibians.
This doubtless was true of the amphibians of the coal period.
Fleischmann first discusses the differences between the classes of vertebrates; the mammals, birds, reptiles, amphibians and fish.
But luckily about a hundred of the amphibians came on to the beach.
Do everything in your power to halt the march of Moyen's amphibians!
As for the creatures of the deep, the reptiles and amphibians, most of them were dead.
1630s, "having two modes of existence, of doubtful nature," from Greek amphibia, neuter plural of amphibios "living a double life," from amphi- "of both kinds" (see amphi-) + bios "life" (see bio-).
Formerly used by zoologists to describe all sorts of combined natures (including otters and seals), the biological sense "class of animals between fishes and reptiles that live both on land and in water" and the noun derivative both are first recorded 1835. Amphibia was used in this sense from c.1600 and has been a zoological classification since c.1819.
A cold-blooded, smooth-skinned vertebrate of the class Amphibia. Amphibians hatch as aquatic larvae with gills and, in most species, then undergo metamorphosis into four-legged terrestrial adults with lungs for breathing air. The eggs of amphibians are fertilized externally and lack an amnion. Amphibians evolved from lobe-finned fish during the late Devonian Period and include frogs, toads, newts, salamanders, and caecilians.
Our Living Language : Amphibians, not quite fish and not quite reptiles, were the first vertebrates to live on land. These cold-blooded animals spend their larval stage in water, breathing through their gills. In adulthood they usually live on land, using their lungs to breath air. This double life is also at the root of their name, amphibian, which, like many scientific words, derives from Greek. The Greek prefix amphi- means "both," or "double," and the Greek word bios means "life." Both these elements are widely used in English scientific terminology: bios, for example, is seen in such words as biology, antibiotic, and symbiotic.
Vertebrate animals, such as frogs, that live part of their life cycle in the water and the other part on land.
Note: Amphibian is also used to describe things such as vehicles that can operate both on land and in the water.
Note: Amphibians were the first land-dwelling animals to evolve.