results are presented in an essentially similar form. The aim of the experiment was to determine how close together two chickens could feed before agonistic behavior developed (i.e. to determine the minimalapproach distance).
260 Material I and methods. Observations were made on two established
, indicating that males have the ability to discriminate between a familiar, often shared neighbour song and an unshared stranger one (Table 3).
Variance explained by the first factor of a PCA, loading factors of three behavioural measures (the minimalapproach distance, the time spent within