In this blog, I will take you behind the scenes in animal research. My goal is to show you the animals behind news stories about medical advances. There is a harm-benefit balance in how scientists use animals, and only with detail and transparency can you evaluate for yourself the harms animals experience and the benefits scientists seek. Some of this is wonky and technical, and some is graphic (I will warn you). Some of it only tangentially touches on laboratory animals, as our impact on animal welfare reaches everywhere there are animals.