THE BREEDING OF THE BLACKBIRD TURDUS MERULA AT OXFORD

Summary 1. Breeding statistics are given for a garden population of Blackbirds, and less complete data for a woodland population. Comparison is also made with data provided by the British Trust for Ornithology nest‐record cards. 2. The breeding season lasts from March to June. Temperature influences the timing of the start of breeding, and rainfall probably influences the ending of breeding. Yearling females tend to begin to breed later than old...