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(n.) An American singing bird (Dolichonyx oryzivorus). The male is black and white; the female is...

A sterile female born co-twin with a male. Occurs most commonly in cattle, very rarely in sheep,...

( Aix galericulata. ), a bird of the family Anatidae. The body length measures about 40 cm, and the...

motile male and female sex cells (gametes) in many lower plants (green and brown algae, such lower...

( Addax nasomaculatus. ), an artiodactyl of the family Bovidae. The male measures up to 2 m long,...