Since time immemorial, humans have had a knack for being complete and utter dicks to the other animals we share our planet with. Often, we even manage to screw things up for other species without meaning to. A study published earlier this month in the journal of Emerging Infectious Disease has retroactively uncovered one such incident: That time we gave a town of chimpanzees a cold bug that ultimately left five dead, including an adorable 2-year-old baby named Betty (pictured above).