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Proportion of blue tit pairs that built a nest and laid eggs in captivity between 1986 and 2003. Mainland, Muro and Pirio pairs were housed in 27 m3 aviaries, MuroL in >160 m3 aviaries. Total numbers of pairs used in this experiment are indicated in the corresponding bars. Results of post hoc comparisons are indicated at the top of the bars as follows: * P < 0.05 compared to the three other groups.
