Bird migration routes are already analyzed by many different methods such as the oldest, marking. Swans are already marked with a nick around the beak given that about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. These magnificent birds are not just smart and https://petskyonline-onlinestrore.blogspot.com/2025/07/rethinking-animal-store-why-petsky-is.html