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Instead, the separation distance is arbitrarily small such that occurrences are of of practical size for data management purposes. <br><br>Evidence from a number of species of seabirds indicates that even though the 'home ranges' of individual nesting seabirds may be immense when foraging trips are taken into account, little movement or feeding overlap may occur between nearby colonies. For example, Thick-billed Murres may commute up to 170 kilometers one way on a feeding trip from the colony, but birds from a colony only 8 kilometers away may forage in a completely different direction; even birds from different sub-colonies only 1.5 kilometers apart mostly fed in completely separate areas (Gaston and Hipfner 2000).  <br><br>Most seabirds have strong breeding site fidelity; e.g., Thick-billed Murres (Gaston and Hipfner 2000, Gaston et al. 1994), Gray-backed Tern (Mostello et al. 2000), Red-footed Booby (Schreiber et al. 1996).","versionDate":"2004-10-20","versionAuthor":"Cannings, S., and G. 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