Fowl migration routes are studied by several different strategies including the oldest, marking. Swans are already marked having a nick to the beak since about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. Hen migration is mostly synchronised to reap the benefits of seasonal https://petskyonline-onlinestrore.blogspot.com/2025/07/rethinking-animal-store-why-petsky-is.html