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 produce...

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...

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

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...

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

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...

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...

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...

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

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

Endangered Species Act of 1973 (ESA; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting and conserving imperiled species. Designed...

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,...

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

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

Species affinis (commonly abbreviated to: sp., aff., or affin.) is taxonomic terminology in zoology and botany. In open nomenclature it indicates that...

its last member if it loses the capacity to reproduce and recover. As 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...

This page features lists of species and organisms that have become extinct. The reasons for extinction range from natural occurrences, such as shifts...

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...

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

Species 8472, formally known as Undine, is a fictional extraterrestrial species in the science fiction television series Star Trek: Voyager. Species 8472...

biological taxonomy, a species nova (plural: species novae; abbreviation: sp. nov. plural abbreviation: spp. nov.) is a new species. The phrase is Latin...

sometimes used in botany in place of phylum), class, order, family, genus, and species. The Swedish botanist Carl Linnaeus is regarded as the founder of the current...

tree species, grouped generally by biogeographic realm and specifically by bioregions, and shade tolerance. Shade-tolerant species are species that are...

endangered species in Wiktionary, the free dictionary. An endangered species is a plant or animal species that is near extinction. Endangered Species may also...

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

the species discovery curve (also known as a species accumulation curve or collector's curve) is a graph recording the cumulative number of species of...

A mixed-species feeding flock, also termed a mixed-species foraging flock, mixed hunting party or informally bird wave, is a flock of usually insectivorous...

Naturalisation (or naturalization) is the ecological phenomenon through which a species, taxon, or population of exotic (as opposed to native) origin integrates...

to: The Species film series Species (franchise) Species (film), a 1995 science fiction/horror film Species II, the sequel to Species Species III, a direct-to-video...