If you're a couple of European white swans, it's hard work surviving in the wild - finding food, bringing up families, getting through freezing weather and facing natural dangers. It helps a lot though if you have managed to find a good safe stretch of water to live in, like the moat around the city of Ypres in Belgium. But when the humans suddenly start fighting a war with bombs and guns right where your home is, life gets a lot more difficult. The...