resident bird; nonmigratory bird
Ornithological term for a bird species that stays in the same area year-round, as opposed to a migratory bird.
Sparrows are resident birds in Japan.
渡り鳥 migrates seasonally between regions, while 留鳥 stays in the same area all year round.
Compound of 留 (りゅう, 'stay') and 鳥 (ちょう, 'bird').