A Ringlet butterfly. Photo by Liz Cutting. As part of National Butterfly week, the British Trust for Ornithology (BTO) is asking people to look out for butterflies in their gardens and take part in its Garden BirdWatch, which also monitors butterflies and other garden wildlife alongside birds. The survey is free to take part in and is the only one that monitors garden wildlife throughout the year. Don’t worry if you do not have an in-depth knowledge of butterflies as there are online guides available. Rob Jaques, BTO Garden BirdWatch, said: “It is not all bad news for our garden butterflies, at least one has done better than usual this year.