A male Amazon river dolphin (Inia geoffrensis) urinating into the airClaryana Araujo-WangMale Amazon river dolphins have been documented rolling upside down and firing a stream of urine into the air. As if that isnt bizarre enough, other males will usually seek out the urine as it arcs back down to the water, possibly to receive social cues in a similar way to how land mammals use scent marking.Claryana Arajo-Wang at CetAsia Research Group in Ontario, Canada, and her colleagues documented the unusual behaviour while studying Amazon river dolphins (Inia geoffrensis), or botos, in the