BOER P (1970) The Dutch Eurasian Oystercatcher Haematopus ostralegus as a resident and migrant. LIMOSA 43 (3): 127-131.

Netherlands were studied. The percentage of these recoveries was 6.5. Over the period of 1912-65 there were 514 recoveries available. From these recoveries those from the months September to February inclusive were assumed to represent the migration period (179 recoveries). 1. First-year oystercatchers did not migrate farther than old birds, so that there is no connection between age and migration distance. 2. a. Since the impression prevailed that oystercatchers hatched inland showed a greater tendency to migrate than oystercatchers hatched in coastal areas, the Netherlands were divided in two areas: a coastal area (up to 10 km from the coast) and the inland (over 10 km from the coast). b. To avoid difficulties arising from partial migration - as discussed in the paper, the following definition was maintained: Oystercatchers which in the period from September to February inclusive are found in an area over 100 km from the nesting site and in a southern direction from it, are considered to be not resident birds. When the factors mentioned under 2 were considered, and also the factor whether the recovery was from a shot bird or not (see Cave), the conclusion was that the greater part of inland oystercatchers are migratory birds and that the coastal oystercatchers are mainly residents. Eurasian Oystercatcher Haematopus ostralegus

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