The two most common systems are the classification adopted by the website AmphibiaWeb, University of California ( Berkeley ) and the classification by herpetologist Darrel Frost and the American Museum of Natural History, available as the online reference database Amphibian Species of the World.

Species of Allium, Gilliesia, Ipheion, Leucocoryne, Nothoscordum, and Tulbaghia are cultivated as ornamentals.

Increasingly, hydro-power operations are required to meet standards under the U. S. Endangered Species Act and other agreements to manage operations to minimize impacts on salmon and other fish, and some conservation and fishing groups support removing four dams on the lower Snake River, the largest tributary of the Columbia.

Species may be split-listed meaning that some populations of a species are on one Appendix, while some are on another.

Species are proposed for inclusion in or deletion from the Appendices at meetings of the Conference of the Parties ( CoP ), which are held approximately once every three years, the most recent of which ( CoP 15 ) was held in Qatar in March 2010.

Species from this order are distributed across all of the continents except Antarctica.

Species have functional traits that are uniquely adapted to the ecological niche.

It is estimated that no more than 5, 000 remain in the wild, and based on International Species Information System records, more than 450 are kept in zoos.

Gray whales are protected under Canada's Species at Risk Act which obligates Canadian governments to prepare management plans for the whales and consider the interests of the whales when permitting development.

Two of his works, the first edition of the Species Plantarum ( 1753 ) for plants and the tenth edition of the Systema Naturae ( 1758 ), are accepted as among the starting points of nomenclature ; his binomials ( names for species ) and his generic names take priority over those of others.

Species in this order typically have the following characteristics, although there are exceptions to all of them:

Species in their natures and geographical distribution, are direct expressions of the intelligence and will of God not the results of blind chance.

Species of interest to aquarists are almost always members of the family Poeciliidae, most commonly guppies, mollies, platies, swordtails, and limias.

The term was introduced by Darwin in his groundbreaking 1859 book On the Origin of Species, in which natural selection was described by analogy to artificial selection, a process by which animals and plants with traits considered desirable by human breeders are systematically favored for reproduction.

The term was introduced by Darwin in his influential 1859 book On the Origin of Species, in which natural selection was described as analogous to artificial selection, a process by which animals and plants with traits considered desirable by human breeders are systematically favored for reproduction.

Species included in the Naraoiidae are known from the second half of the Lower Cambrian to the end of the Upper Silurian.

Species, cultivars and hybrids are all widely grown for their beauty and fragrance.

Species of Streptococcus are classified based on their hemolytic properties.

The Tiger Species Survival Plan devised by the Association of Zoos and Aquariums has condemned the breeding of white tigers on the allegation that they are of mixed ancestry, hybridized with other subspecies and are of unknown lineage.

Species are pitted against species for shared resources,

Species of Velociraptor, have also been reported from the slightly younger Barun Goyot Formation of Mongolia, though these are indeterminate and may belong to a related genus instead.

This tree diagram, used to show the divergence of species, is the only illustration in the Origin of Species.

Darwin used the term twice in the 1859 first edition of his work On the Origin of Species, in Chapter IV: Natural Selection, and in Chapter VI: Difficulties on Theory –

Species in the genus Amomum are also used in traditional Indian medicine.

Species that used to inhabit the island include the mountain lion ( or puma ) and the gray wolf.

The following synonyms are or have been in use: Fagus castanea ( used by Linnaeus in first edition of Species Plantarum, 1753 ).

* Religion: Willow is one of the " Four Species " used ritually during the Jewish holiday of Sukkot.

Species and hybrids are widely used in gardens and landscapes, with various common names — daffodil, narcissus, jonquil — that are used variously to describe all or some of the genus.

Babbitt wrote a book in 2005 titled Cities in the Wilderness: A New Vision of Land Use in America, where he proposes to amend the Endangered Species Act so that it is used to identify, conserve, and protect landscapes, watersheds, and ecosystems whether or not an endangered species exists there.

Members of Species 8472 exclusively attack with their claws and raw strength ; they never use a hand-held weapon, instead allowing their superior immune system to be used in an offensive role.

Tigers that are not genetically pure will not be able to participate in the tiger Species Survival Plan, as they are not used for breeding, and are not allowed to be released into the wild.

It is one of the Four Species used during the Jewish holiday of Sukkot.

While in modern Hebrew this is the name for any variety of citron, its English usage applies to those varieties and specimens used as one of the Four Species.

In the first edition of On The Origin of Species, Charles Darwin used an estimate for the erosion of the chalk, sandstone and clay strata of the Weald in his theory of natural selection.

Darwin also noted, in On the Origin of Species, that a vestigial structure could be useless for its primary function, but still retain secondary anatomical roles: " An organ serving for two purposes, may become rudimentary or utterly aborted for one, even the more important purpose, and remain perfectly efficient for the other .... n organ may become rudimentary for its proper purpose, and be used for a distinct object.

The kits contain objects that can be used to explain why an animal is endangered or to shed light on the animal's lifestyle. Some of the kits are: Conservation Kit, Endangered Species Kit, Behavioral Enrichment Kit, and Animal Diet Kit.

Species used as nest trees vary with region and subspecies.

Species accumulation curves and the number of species only represented by one or a few individuals can be used to help in estimating how representative the available sample is of the population from which it was drawn.

Species in the genus may be referred to as " pipistrelles " or " pipistrelle bats ", though these terms are also used for species now placed in other genera, such as the western pipistrelle ( Parastrellus hesperus ) and eastern pipistrelle ( Perimyotis subflavus ) of North America.

Species used as sources of firewood include:

Herbert Spencer first used the phrase – after reading Charles Darwin's On the Origin of Species – in his Principles of Biology ( 1864 ), in which he drew parallels between his own economic theories and Darwin's biological ones, writing, " This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called ' natural selection ', or the preservation of favoured races in the struggle for life.

Darwin first used Spencer's new phrase " survival of the fittest " as a synonym for natural selection in the fifth edition of On the Origin of Species, published in 1869.

Herbert Spencer first used the phrase — after reading Charles Darwin's On the Origin of Species — in his Principles of Biology of 1864 in which he drew parallels between his economic theories and Darwin's biological, evolutionary ones, writing, “ This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called ' natural selection ', or the preservation of favoured races in the struggle for life.

In the first four editions of On the Origin of Species, Darwin used the phrase " natural selection ".