A species (pl.: species) is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can...

An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction...

A vulnerable species is a species which has been categorized by the International Union for Conservation of Nature as being threatened with extinction...

An invasive species is an introduced species that harms its new environment. Invasive species adversely affect habitats and bioregions, causing ecological...

In zoological nomenclature, a type species (species typica) is the species name with which the name of a genus or subgenus is considered to be permanently...

introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a...

On the Origin of Species (or, more completely, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle...

precise meanings are cryptic species for two or more species hidden under one species name, sibling species for two (or more) species that are each other's closest...

Speciesism (/ˈspiːʃiːˌzɪzəm, -siːˌzɪz-/) is a term used in philosophy regarding the treatment of individuals of different species. The term has several...

last member if it loses the capacity to reproduce and recover. Because a species' potential range may be very large, determining this moment is difficult...

An IUCN Red List Critically Endangered (CR or sometimes CE) species is one that has been categorized by the International Union for Conservation of Nature...

Version 2014.2 of the IUCN Red List of Threatened Species identified 4574 Critically Endangered species, subspecies and varieties, stocks and subpopulations...

of a new species of organism and explain how it differs from species that have been previously described or related species. For a species to be considered...

International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is...

the IUCN Red List of Threatened Species identified 5220 (2754 animals, 1 fungus, 2464 plant, 1 protist) endangered species, subspecies and varieties, stocks...

A keystone species is a species that has a disproportionately large effect on its natural environment relative to its abundance. The concept was introduced...

A rare species is a group of organisms that are very uncommon, scarce, or infrequently encountered. This designation may be applied to either a plant...

A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a...

Species richness is the number of different species represented in an ecological community, landscape or region. Species richness is simply a count of...

number of lists of fictional species: List of fictional extraterrestrials (by media type) Lists of fictional alien species: A, B, C, D, E, F, G, H, I,...

Species: The Awakening is a 2007 science fiction action thriller television film and the fourth and final installment of the Species film series. The film...

Foundation. Its aim is to create a comprehensive open content catalogue of all species; the project is directed at scientists, rather than at the general public...

Species is a 1995 American science fiction horror film directed by Roger Donaldson and written by Dennis Feldman. It stars Ben Kingsley, Michael Madsen...

system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which...

A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened...

extinction event. Bamboo species can be divided into two groups: sympodial (clumping) and monopodial (running) species. Sympodial species grow from the soil...

modern humans are the most common and widespread species of primate, and the last surviving species of the genus Homo. They are great apes characterized...

In biogeography, a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only local natural evolution...

biological classification, subspecies (pl.: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape...

Species reintroduction is the deliberate release of a species into the wild, from captivity or other areas where the organism is capable of survival....