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Intersex people are individuals born with any of several sex characteristics, including chromosome patterns, gonads, or genitals that, according to the...

The barn owl (Tyto alba) is the most widely distributed species of owl in the world and one of the most widespread of all species of birds, living almost...

Variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are viruses that, while similar to the original, have genetic changes that are...

Fitness (often denoted w {\displaystyle w} or ω in population genetics models) is a quantitative representation of individual reproductive success. It...

The green anaconda (Eunectes murinus), also known as the giant anaconda, emerald anaconda, common anaconda, common water boa, or southern green anaconda...

The term variant of concern (VOC) for SARS-CoV-2, which causes COVID-19, is a category used for variants of the virus where mutations in their spike protein...

A free-ranging dog is a dog that is not confined to a yard or house. Free-ranging dogs include street dogs, village dogs, stray dogs, feral dogs, etc....

A cotton gin—meaning "cotton engine"—is a machine that quickly and easily separates cotton fibers from their seeds, enabling much greater productivity...

Eudromaeosauria ("true dromaeosaurs") is a subgroup of terrestrial dromaeosaurid theropod dinosaurs. They were small to large-sized, feathered hypercarnivores...

Velociraptorinae is a subfamily of the theropod group Dromaeosauridae. Definitive fossils attributed to the subfamily have only been found in the Late...

Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies....

Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or Hadrosauridae, and all dinosaurs more...

Tyrannosaurinae (sometimes referred to as tyrannosaurines) is one of the two extinct subfamilies of Tyrannosauridae, a family of coelurosaurian theropods...

Dromaeosaurinae is a subfamily of the theropod group Dromaeosauridae. The earliest dromaeosaurine is Utahraptor, dating back to the Early Cretaceous in...

Street dogs, known in scientific literature as free-ranging urban dogs, are unconfined dogs that live in cities. They live virtually everywhere cities...

Sinovenatorinae is a subfamily of the extinct bird-like troodontid dinosaurs known exclusively from the Early Cretaceous of China. It includes the genus...

Saurornitholestinae is a subfamily of the theropod group Dromaeosauridae. The saurornitholestines currently include monotypic genera Atrociraptor marshalli...

Opisthocoelicaudiinae is a subfamily of titanosaurian dinosaurs from the Late Cretaceous. It was named by John McIntosh in 1990. Opisthocoelicaudiines...

Cryogenic electron microscopy (cryo-EM) is a cryomicroscopy technique applied on samples cooled to cryogenic temperatures. For biological specimens, the...

Daspletosaurini is an extinct clade of tyrannosaurine dinosaurs that lived in Laramidia during the Late Cretaceous (Middle Campanian) period. It consists...