Seasonal marriage
In animal species, seasonal marriage is a community that, in contrast to permanent marriage, is only given for a certain period of time.
Many animal species have time marriages ( great gray owls , gray herons , greenfinches , house sparrows , stilts ), which, for example, extend over a growing season in order to take care of the brood together.
Even storks perform marriages season, yet live in generally monogamous, because both sides of the common nesting site connects.