The fact that any small, cold blooded animal such as the insects can sustain temperatures below the freezing point of water has to be one of the most remarkable features of animal evolution. Even more impressive, the “snow fly” Chionea alexandriana is part of an elite group of insects that can maintain high levels of activity at sub-freezing temperature, and can often be spotted running on the snow-covered ground at temperatures between +3 and -5°C. Image created by Sarah Becan for the...