Before revision: 250px|It is possible that homing pigeons may navigate by smell Olfactory navigation is a hypothesis put forward to explain navigation and homing of pigeons, in particular the homing pigeon .
After revision: 250px|It is possible that homing pigeons may navigate by smell Olfactory navigation is a hypothesis that proposes the usage of the sense of smell by pigeons, in particular the mail pigeon, in navigation and homing .