There’s a word for when we see bird species out of their normal range
Irruption (noun, “ear-RUPT-shun”, verb “to irrupt”)
The word for when a group of organisms suddenly increases in number. This could mean that a population of animals has bred rapidly. It could also mean that a species is being seen where it is not usually found.
In a sentence
There may be a winter irruption of songbirds farther south than usual if seed crops in the north can’t support their numbers.
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irruption (v: to irrupt) A sudden increase in a population. This may mean a larger number of animals in their usual geographical range, or a population observed far away from where they are normally seen.