 Breeding pairs may have one breeding territory close to the high water mark that they are able to feed in, or have two territories that are defended, one for feeding and one for nesting.Nesting territories have an average size of 1.6 ha, and nests can be as close as 16.2 m to each other.The size and boundaries of these territories do not appear to differ much between years of breeding, and site fidelity was recorded as 97.3% for pairs that stayed together between years.