Abstract

1. 1. Three series of experiments were run by releasing pigeons which had been made anosmic by washing their olfactory membranes with zinc sulphate solution. 2. 2. Our findings confirm that olfactory information plays a basic role in the pigeon homing process from unfamiliar sites. 3. 3. Olfactory cues cannot be replaced by astronomical, geographical and geomagnetic ones from unfamiliar sites.

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