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.

It is one of the ironic quirks of history that the viability and usefulness of nationalism and the territorial state are rapidly dissipating at precisely the time that the nation-state attained its highest number ( approximately 100 ).

The only factors that are personally set by the choreographer are the movements themselves, the number of the dancers, and the approximate total duration of the dance.

Presumably a cocktail party is expected to fulfill the host's desire to get together a number of people who are inadequately acquainted and thereby arrange for bringing the level of acquaintance up to adequacy for future cooperative endeavors.

The completeness of the connections provide that, for N people, there are Af lines of communication between the pairs, which can become a large number ( 1,225 ) for a party of fifty guests.

In Figure 2, the points in the network are designated by a letter accompanied by a number.

are few in number, briefly worded, all different in sound ; ;

I assume that the number of readers of this anthology who regard themselves as morally perfect is small, and that most readers are willing to consider procedures by which they may gain more insight into themselves and better understanding of others.

Their expressed standards concerning sex roles, desirable age for marriage, characteristics of an ideal mate, number of children desired are congruent with the values and stereotypes of the preceding generation -- minus compulsive rebellion.

Although the United States and the U.S.S.R. have been arguing whether there shall be four, five or six top assistants, the most important element in the situation is not the number of deputies but the manner in which these deputies are to do their work.

People who take us for suckers are like the Westerner who had on exhibit his superior marksmanship in the form of a number of bull's-eye achievements.

There are a number of other considerations besides this one but it is for the Congress, not the Department of Justice, to balance these various considerations and make a judgment about legislation.

Nonetheless, although few in number they are a stubborn crew, as tenacious of life as the Hardshell Baptists, which suggests that there is some kind of vital principle embodied in their faith.

For that is the one an increasingly large number of prominent Americans are now proposing.

and it is still very far from certain how valid the party's claim is that in `` a growing number of kolkhozes '' the peasants are finding it more profitable, to surrender their private plots to the kolkhoz and to let the latter be turned into something increasingly like a state farm.

Hence all teachers, good and bad, who have been teaching for a given number of years are paid the same salary.

They are conscious of this state's new feeling of optimism and assurance and are definitely impressed by the number of new plants and construction projects in Rhode Island.

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.

These data are not of the precision obtainable by the methods previously mentioned, but the vast number of approximate values available will be useful in many areas.

These expenditures are estimated to be $12.1 billion, an increase of $187 million over 1960, reflecting additional longevity pay of career personnel, more dependents, an increased number of men drawing proficiency pay, and social security tax increases ( effective for the full year in 1961 compared with only 6 months in 1960 ).

Retired pay costs are increased by $94 million in 1961 over 1960, partly because of a substantial increase in the number of retired personnel.

Rather, such assignments are made, as they must be, on the basis of certain overall rules and standards, representing to some extent a statistical approach to the problem, taking into account for each situation some of the variables ( e.g., power and station separations ) and averaging out others in order to achieve the balance which must be struck between protection against destructive interference and the assignment of a number of stations large enough to afford optimum radio service to the Nation.

Since broadcast frequencies are very limited in number, these objectives are to some extent inconsistent in that not all of them can be fully realized, and to the extent that each is realized, there is a corresponding reduction of the possibilities for fullest achievement of the others.