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They nest in a scrape on pebbles which may be on the coast, riverside or in grassy fields and even upland moors. The clutch consists of 2-4 eggs which are coloured buff to yellow possibly with a greenish tint; there are variable markings of streaks and spots from greyish to black.
There is a single clutch, usually in May.
Chandler, R. (2009). Shorebirds of North America, Europe, and Asia: A photographic guide. Princeton.
Hockey, P., Kirwan, G.M. & Boesman, P. (2018). Eurasian Oystercatcher (Haematopus ostralegus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/53753 on 9 October 2018).
Evans, G. & Swain, H.D. (1985). Observers Book of Birds Eggs. Frederick Warne.