Chook migration routes have been studied by a range of tactics including the oldest, marking. Swans are already marked using a nick on the beak due to the fact about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. Hen migration is mostly synchronised to https://petskyonline-onlinestrore.blogspot.com/2025/07/rethinking-animal-store-why-petsky-is.html