A species is a group of living organisms that are all broadly similar and can, at least in principle, breed with one another. This seems straightforward enough, but the word “species” is ...

A species is a distinct group of organisms and the most basic unit used to measure life on Earth. However, there’s no single definition of a species, meaning this vital concept in biology can be ...

Closely related species form a genus, which are put together into larger and more distantly related groups of organisms until they reach domains, the top rank. The traditional three domains of ...

Guiunio rarus, or the rare Guangxi freshwater mussel, was found “living in the slow flowing stream with muddy and sandy bottom” alongside other species, according to the study. The mussels were also ...

A two-year study into the Australian wishbone spiders by experts from Queensland Museum, Western Australian Museum and the ...