The total number of known amphibian species is approximately 7, 000, of which nearly 90 % are frogs.

The actual number of species in each group depends on the taxonomic classification followed.

The numbers of species cited above follow Frost and the total number of known amphibian species is approximately 7, 000, of which nearly 90 % are frogs.

A number of fossil cryptobranchids have been found but there are only three living species, the Chinese giant salamander ( Andrias davidianus ), the Japanese giant salamander ( Andrias japonicus ) and the hellbender ( Cryptobranchus alleganiensis ) from North America.

A caecilian's skin has a large number of transverse folds and in some species contains tiny embedded dermal scales.

Altogether, over two hundred toxins have been isolated from the limited number of amphibian species that have been investigated.

A number of causes are believed to be involved, including habitat destruction and modification, over-exploitation, pollution, introduced species, climate change, endocrine-disrupting pollutants, destruction of the ozone layer ( ultraviolet radiation has shown to be especially damaging to the skin, eyes, and eggs of amphibians ), and diseases like chytridiomycosis.

Thus although most species in the order are herbaceous, some no more than 15 cm high, there are a number of climbers ( e. g. some species of Asparagus ), as well as several genera forming trees ( e. g. Agave, Cordyline, Yucca, Dracaena ), some of which can exceed 10 m in height.

By its inclusion the order has grown enormously in number of species.

The order is a cosmopolite ( plants found throughout most of the world including desert and frigid zones ), and includes mostly herbaceous species, although a small number of trees ( such as the giant Lobelia and the giant Senecio ) and shrubs are also present.

Despite the large number of species in order Asterales, they do not compare in economic benefit for mankind to the Poales or to the Fabaceae.

A number of species have come to be considered invasive, including, most notably in North America, dandelion, which was originally introduced by European settlers who used the young leaves as a salad green.

The number of species recognized worldwide ranges between 30 and 130 with over 200 species-level taxa described.

Each abalone species has a typical number of holes in the selenizone which remain open.

A number of species such as the Royal Cinclodes and White-browed Tit-spinetail are associated with Polylepis, and consequently also threatened.

It is improbable, however, that the production of amber was limited to a single species ; and indeed a large number of conifers belonging to different genera are represented in the amber-flora.

* Lory, one of a number parrot species belonging the Loriinae subfamily comprising lories and lorikeets

The number of species is disputed, with some authorities accepting up to ten species, while others accept six or fewer.

It has been observed through a variety of environments that as the level of abiotic stress increases, the number of species decreases.

Flightless birds include ratites, penguins, and a number of diverse endemic island species.

Some birds, especially corvids and parrots, are among the most intelligent animal species ; a number of bird species have been observed manufacturing and using tools, and many social species exhibit cultural transmission of knowledge across generations.

We should not become confused or let our public become confused over irrelevant questions of number or even of geography.

For those communities which have financial difficulties in effecting adjustments, there are a number of alternatives any one of which alone, or in combination with others, would minimize if not even eliminate the problem.

But even if that other plant employs the same number of workers and makes the same product, there are other facts to consider.

For it is clear that the total number of ordinary intersections of C and Af must be even ( otherwise, starting in the interior of C, Af could not finally return to the interior ), and the center of rotation at T is the argument of the function, not a value.

Thus the multiplicity of Af for a given T must be an even number.

The remaining ( incomplete ) components all have an even number of ordinary points at any argument, and are defined only on a proper sub-interval of Aj.

So a quick count could be made at any time, even by an illiterate clerk, of the number of registered persons in four age-and-sex classes.

Sometimes even the number of syllables is not clear.

Tonal morphophonemics is much more confusing to the beginning analyst than consonantal morphophonemics, even when the total number of rules is no greater.

If we thus spent our very first day in the midst of a large number of your people honoring a new hero and a great national achievement, our last day, to us at least, was equally impressive and very moving, even though the crowds were absent and there was almost complete silence.

Instead of Catholics' being obliged or even encouraged to beget the greatest possible number of offspring, as many Non-Catholics imagine, the ideal of responsible parenthood is stressed.

A student orator `` produced tears from a great number of the learned '' even before the punch was served.

Moreover, prudence alone would indicate that, unless the local customs are already ready to fall when pushed, the results of direct economic action everywhere upon national chain stores will likely be simply to give undue advantage to local and state stores which conform to these customs, leading to greater decentralization and local autonomy within the company, or even ( as the final self-defeat of an unjust application of economic pressure to correct injustice ) to its going out of business in certain sections of the country ( as, for that matter, the Quakers, who once had many meetings in the pre-Civil War South, largely went out of business in that part of the country over the slavery issue, never to recover a large number of southern adherents ).

Alexandre Livshitz repeated a fantastic technical bit from the closing number, `` Taras Bulba '', but even then there was a substantial number of diehards who seemed determined not to go home at all.

An even stronger assertion is that It is impossible by any procedure to reduce the temperature of a system to zero in a finite number of operations.

This led to the first of a number of periods in which an outside power controlled Athens ; Often the outside power set up a local agent as political boss in Athens ; but when Athens was independent, it operated under its traditional form of government ; even the bosses, like Demetrius of Phalerum, kept the traditional institutions in formal existence.

Historically, the size of farms and landed estates in the United Kingdom was usually expressed in acres ( or acres, roods, and perches ), even if the number of acres was so large that it might conveniently have been expressed in square miles.

A small number of words have completely different meanings in the two dialects or are even unknown or not used in one of the dialects.

Installers of multi-line business services where outgoing calls from all lines display the company's main number on call display can use ANAC to identify a specific line in the system, even if CID displays every line as " line one ".

Plans to make a third Evil Dead film had been circulating for a number of years, even prior to the production of Darkman.

It is not known whether an even-odd pair of amicable numbers exists, but if it does, the even number must either be a square number or twice one, and the odd number must be a square number.