Fig. 2. Series 1. Pooled homing performance from Marinella, Agliana and Bolgheri. Each symbol identifies the performance of one pigeon. C, intact control pigeons; V1, pigeons subjected to the section of the ophthalmic branch of the trigeminal nerve; ON, pigeons subjected to the section of the olfactory nerves; km h^–1, mean homing speed of the birds that homed on the day of the release; 1 day, pigeons that homed on the day after the release; later, pigeons that homed later than the day after the release; lost, pigeons that never returned home. Pigeons that homed together are not included in the diagrams.