The farmland multispecies index was most concordant with the indices of Pica pica, Columba palumbus, Hirundo rustica, Turdus pilaris, Corvus corone, and Tringa totanus ([r.sub.s] = 0.39-0.53, n = 28 years, p < 0.05); in the woodland index the most similarly co-varying species were Turdus merula, Sitta europaea, Dryocopus martius, Dendrocopos major, Garrulus glandarius, Pyrrhula pyrrhula,
Certhia familiaris, Troglodytes troglodytes, Corvus corax, Erithacus rubecula, and Regulus regulus ([r.sub.s] = 0.38-0.74, n = 28 years, p < 0.05).
Behavioural responses of Eurasian Treecreepers, Certhia familiaris, to competition with ants.
Seasonal and geographical variation in the clutch size of the Common Treecreeper Certhia familiaris. Ornis Fennica 64:125-136.
Food availability and the male's role in parental care in double-brooded Treecreepers Certhia familiaris. Ibis 138:638-643.
Food choice and feeding by male and female common treecreeper (Certhia familiaris) during the nestling period.