A species is a group of closely related, physically similar beings that can interbreed freely. In practice, the dividing lines between species or between species and subspecies are sometimes unclear. In sorting out species, biologists search for...

The term species, in the most general sense, refers to the various kinds of living things. Thus, species are generally recognized as distinct, fully differentiated groups of organisms. However, most modern definitions of species also recognize them as...

A species is a population of individual organisms that can interbreed in nature, mating and producing fertile offspring in a natural setting. Species are organisms that share the same gene pool, and therefore genetic and morphological similarities. All...

The term species is used to describe a group of closely related, physically similar organisms that can interbreed. In taxonomical classification of plants and animals, species is the most specific category, following in order kingdom, phylum (animals)...

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is...

SCIENTISTS have long warned that global warming is causing such changes in habitats that many plant and animal species might not be able to survive the heat. Now, 19 researchers have predicted just how severe the impact will be if current climate trends continue:...

ALTHOUGH THE South was victimized by two devastating hurricanes this year, it was also the site of a heartening natural event: the discovery that the rare ivory-billed woodpecker is not extinct after all. There will be fewer such hair's-breadth escapes from extinction, though, if...

Scientists have discovered 11 new species of plants and animals in Vietnam, including a snake, two butterflies and five orchid varieties, the World Wildlife Fund said Wednesday.The new species were found in a remote region known as the "Green Corridor" in Thua Thien Hue province...

The Interior Department is considering a broad revamping of how it protects animals and plants in danger of extinction, including changes that critics contend will reduce the number of species that will be saved.Details of some of the proposed changes surfaced Tuesday in a number...