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Birds that mate with multiple partners in one breeding season.

Birds that are hatched in an undeveloped state and need care by the parents.

Birds that have a bluish coloration on their feet.

Birds that shed old feathers to replace them with new ones.

The process of birds migrating from one place to another.

The act of birds cleaning their feathers with water.

The process by which birds shed old feathers to replace them with new ones.

The act of birds searching for and obtaining food.

Birds that mate with only one partner for a season or often for life.

Birds that have multiple mating partners in one breeding season.