Muscicapa dauurica, an Asian flycatcher.

An electrical phenomenon that produces an ionic wind that transfers its momentum to surrounding neutral particles, observed on an asymmetric capacitor when high voltage is applied to the electrodes.

(obsolete) Synonym of laughing kookaburra

plural of great brown kingfisher

(slang, dated) To do something well or thoroughly.

plural of brown bag test

(US, historical) The alleged practice of comparing an African-American's skin color to that of a brown paper bag, allowing them certain privileges only if the skin was lighter.

Aricia artaxerxes, a species of brown butterfly.

plural of small brown crow

A smallish nymphalid butterfly, Euploea darchia, brown with white spots, endemic to northern Australia.