What's Behind the Mysterious Irruptive Species Migration Patterns?

Some years it seems like certain species are much more common. One reason for this, is that those species may be "irruptive" meaning they may move in greater or lesser numbers depending on their food source that year.
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Cover image background by Jeff Hollet (Public Domain, edited)
Male grosbeak in cover image by Keith Ramos/USFWS (Public Domain, edited)
Female grosbeak in cover image by dfaulder (CC by 2.0, edited)
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