monogamous is the answer.
When birds are vigilant, they rub together the swollen cloaca. The male sperm stored in his cloaca deposits in the female cloaca, where it travels up the chamber and eventually fertilizes the egg.
Most birds mate for only one season and for one reason. However, some species mate for life, while others mate multiple times during the season. Goose, swan, and eagle are known to have only one companion until one of them dies.
Monogamous is a mating system in which one adult male and one adult female are mated. Such a pair of turns can follow a single breeding attempt, breeding season, or many breeding seasons, such as mating mammals, geese, and swans.
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