Chook migration routes have been studied by a number of approaches including the oldest, marking. Swans have already been marked using a nick to the beak considering that about 1560 in England. Scientific ringing was pioneered by Hans Christian Cornelius Mortensen in 1899. The ability of birds to navigate during https://petskyonline-onlinestrore.blogspot.com/2025/07/rethinking-animal-store-why-petsky-is.html