It's not easy being a swan, as this webgame, Endless Migration, is quick to point out. If it's not the swooping jumbo jets that get you, it's the Zeppellins. This is a kind of reverse shoot 'em up, where you must gather a migrating flock and stay alive as storms, aircraft and other hazards batter your numbers. On my first run my flock survived a mere 23.4 seconds. Hmm.