Fowl migration routes have already been researched 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. Other species like merlin Falco columbarius and Eurasian skylark https://ztndz.com/story25455565/top-online-animal-store-dubai-secrets