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 are used as food and flavourings ( e. g. onion, garlic, leek, asparagus, vanilla ), as cut flowers ( e. g. freesia, gladiolus, iris, orchids ), and as garden ornamentals ( e. g. day lilies, lily of the valley, Agapanthus ).

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 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.

Charles Darwin proposed the theory of universal common descent through an evolutionary process in On the Origin of Species, twice stating the hypothesis that there was only one progenitor for all life forms and ending with " There is a grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one ".

Species in the Appendices may be proposed for addition, change of Appendix, or de-listing ( i. e., deletion ) by any Party, whether or not it is a range State and changes may be made despite objections by range States if there is sufficient ( 2 / 3 majority ) support for the listing.

In On the Origin of Species ( 1859 ), Charles Darwin proposed evolution through natural selection, a theory central to modern biology.

The cultivated soybean first appeared in Species Plantarum, by Linnaeus, under the name Phaseolus max L. The combination Glycine max ( L .) Merr., as proposed by Merrill in 1917, has become the valid name for this useful plant.

Darwin's Origin of Species proposed natural selection as the main mechanism for development of species, but did not rule out a variant of Lamarckism as a supplementary mechanism.

The Biological Species Concept, proposed by Ernst Mayr, in 1942, emphasizes reproductive isolation as the basis of defining a species.

However, the steelhead populations are under federal endangered species protections, and chinook salmon have been proposed for Endangered Species Act ( ESA ) protection.

Shortly after the 1859 publication of Charles Darwin's On the Origin of Species, British biologist Thomas Henry Huxley proposed that birds were descendants of dinosaurs.

On June 29, 2009 the U. S. Fish and Wildlife Service published a proposed rule to list the mountain plover as threatened under the Endangered Species Act.

Citing explicit wording of the Endangered Species Act ( ESA ) ensuring habitat for listed species is not disrupted, the Court said " it is clear that the TVA's proposed operation of the dam will have precisely the opposite effect, namely the eradication of an endangered species.

This contention may look convincing at first glance inasmuch as On the Origin of Species is full of observations and proposed mechanisms that clearly fit within the boundaries of modern ecology ( e. g. the cat-to-clover chain – an ecological cascade ) and because the term ecology was coined in 1866 by a strong proponent of Darwinism, Ernst Haeckel.

The ship on which Charles Darwin made the voyage which provided much of the inspiration for On the Origin of Species was named HMS Beagle after the breed, and, in turn, lent its name to the ill-fated British Martian lander Beagle 2.

* Species text for Blue Crane in The Atlas of Southern African Birds

Costa Rica is party to many environmental treaties, including the Convention on Biological Diversity, the Convention on Environmental Modification, the United Nations Framework Convention on Climate Change, the Montreal Protocol, the Ramsar Convention, the International Convention for the Regulation of Whaling, the Desertification Convention, the Endangered Species Convention, the Basel Convention, the Convention on the Law of the Sea, the Convention on Marine Dumping, the Comprehensive Test Ban Treaty.

CITES ( the Convention on International Trade in Endangered Species of Wild Fauna and Flora, also known as the Washington Convention ) is a multilateral treaty, drafted as a result of a resolution adopted in 1963 at a meeting of members of the International Union for Conservation of Nature ( IUCN ).

* 1964 Introduction, Bibliography and Subject Pages vii – xxviii, 491 – 513 in On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, by Charles Darwin.

While Charles Darwin is mainly noted for his treatise on evolution, he was one of the founders of soil ecology, and he made note of the first ecological experiment in The Origin of Species.

When Darwin wrote On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, the oldest animal fossils were those from the Cambrian Period, now known to be about 540 million years old.

The list follows McKenna and Bell's Classification of Mammals for prehistoric genera ( 1997 ) and Wozencraft ( 2005 ) in Wilson and Reeder's Mammal Species of the World for extant genera.

* Society for Marine Mammalogy-Gray Whale Species Account

The list follows McKenna and Bells Classification of Mammals for prehistoric genera ( 1997 ) and Wozencraft ( 2005 ) in Wilson and Reeders Mammal Species of the World for extant genera.

* Early Warning for Endangered Species?

* Cryptobranchus alleganiensis on the IUCN Red List of Threatened Species at International Union for Conservation of Nature

In an often misquoted passage from On the Origin of Species, Charles Darwin appears to acknowledge the eye's development as a difficulty for his theory.

Species for which the reserve is important include Pale-bellied Brent Goose, Wigeon, Teal, Pintail, Merlin, Dunlin, Bar-tailed Godwit and many others.