During 2 high altitude balloon projects this autumn, I’ve been reminded of a little considered hazard to HAB: cows. During work for Phillip Morris and Nationwide I have had payloads land in fields with dairy cows. On both occasions the cows came over to examine the payload. On both occasions the cows were sufficiently interested in the payloads to roll them over, taste them, and urinate on them. The cows lost interest after some time, but not before then payloads were bitten into and licked. In future I will be mindful to factor this into payload design; ensuring that there is nothing to harm and animal that may come into contact with the payloads.