A couple of weeks ago, my colleagues based at Attenborough Nature Reserve made a very unusual discovery when they arrived at the Nature Centre, writes Erin McDaid of Nottinghamshire Wildlife Trust. Rather than spotting a rare species, they stumbled upon a different type of rarity — possibly a first for the reserve — an anonymous donation of £100 cash in an envelope, weighted down with stones. As a charity, we wouldn’t be able to do what we do to protect and restore nature without the support of our thousands of members and donors or the volunteers donating their time and talent. While we are f…