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.
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.
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