Control Pigeons.

RS: release site, home direction and distance; Track: track code and individual pigeon code number are reported; Date: date of release; r and α: mean vector length and directions relative to the sections of tracks recorded in the first (1), the two first (2) and the three first (3) hours after release (see Material and methods for further explanations); ht: homing time expressed in hours and minutes; “day after”, the pigeon homed the day after the release, “later”, the bird homed in the subsequent days, “lost” the bird never homed; at, analysis of the tracks: A, track used in the single release statistical analysis and P used also in the pooled analysis; I, incomplete track which could not be used in the statistical analysis; NR the track was not recorded by the logger. Release from Bolgheri: five out of 11 C pigeons tested at Bolgheri had previously tested at Montespertoli (two former C, two former PA and one former AO). Release from Montespertoli: Six out of 11 C pigeons tested at Montespertoli had been previously released at Bolgheri (3 former C and 3 former AO).