If anyone is having trouble with getting 16 swans here are the upgrades that you should have on ONLY, because some upgrades promote normal bird spawns and less swan spawns. : Eagles eyes, Royal Lineage, Nightvision, Hive Mind, Aerodynamics, Big Wingspan, Rugged Down, and Divine wings. Any others will make it harder to collect swans. If you can afford the two 400's, buy them as well. Also, if there aren't any swans around, stay in one spot, because the geese around you will be in a smaller space which makes it easier to avoid planes coming near you. Only go for the swans you can get. It took me a while to do but believe me its possible! Have fun and enjoy!