Chicken migration routes have already been examined by a variety of techniques including the oldest, marking. Swans happen to be marked having a nick around the beak because about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. Other species for example merlin Falco columbarius https://petskyonline-onlinestrore.blogspot.com/2025/07/rethinking-animal-store-why-petsky-is.html