What type of animal was commonly used to deliver messages during WWI?
Carrier-Pigeons Carrier Pigeon Pigeon flying Homing pigeon Messenger pigeon Carrier pigeons Carrier pigeon Homing pigeons Homing Pigeon Carrier-pigeon
pigeon flying messenger pigeon carrier pigeon carrier pigeons homing pigeon homing pigeons
homing pigeon
WikipediaEntity
Homing Pigeon