How is the movement pattern of the Cedar Waxwing often described, differing from many strictly migratory songbirds?

Answer

Irruptive

Cedar Waxwings are often described as irruptive, meaning large numbers may appear in an area one year and be completely absent the next, rather than following a predictable calendar like strictly migratory species.

How is the movement pattern of the Cedar Waxwing often described, differing from many strictly migratory songbirds?
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