Refers to the bird species Aix galericulata. Also used metaphorically for a loving couple, but that usage is not listed here.
A pair of mandarin ducks are swimming in the pond.
Katakana spelling used especially in biological or field-guide contexts.
Rare kanji form; the reading is a jukujikun (special kanji reading).
The kanji 鴛鴦 are Chinese characters for the mandarin duck, and the Japanese reading おしどり is a jukujikun (special kanji reading) whose exact origin is uncertain.