Balloon releases during festivities are frequently in the spotlights. In the Netherlands, with ‘King’s Day’ coming up on the 27th of April, fierce debates are going on about the damage that balloons may yes or no cause in nature. How can latex, made from natural rubber and thereby ‘degradable’, be harmful? Unfortunately, there is no doubt that some animals die by latex balloons, with others experiencing less obvious damage. Science can not offer full facts and figures on how frequent such events are or the damage involved. In the end, subjective decisions are unavoidable, weighing the expected fun of a release against a poorly quantified risk of harmful consequences. With a listing of ‘small facts’, IMARES Wageningen UR aims to provide some background for such decisions.