W H A T MAY be described as the integrative pattern of the breedingbehaviour of the W r e n (Troglodytes troglodytes) varies in different types of environment (Armstrong, 1950-57). Differences in behaviour patterns are so integrated in this species, and no doubtin others, that variation in one tends to be associated with correlated variations in others. In theory, if a given population of an organ...

Stay at the forefront of British birding by taking out a subscription to British Birds.

Subscribe Now