Wesołowski T., Tomiałojć L. 1986. The breeding ecology of woodpeckers in a primaeval temperate forest - preliminary data. Acta Ornithologica 22: 1-21.

The study was carried out in the Białowieża National Park (E Poland) in 1975-84. Habitat distribution, densities, fluctuation in numbers, nest-sites and timing of breeding of Dendrocopos leucotos,
D. major, D. medius, D. minor, Dryocopus martius and Picoides tridactylus are described.