http://www.sciencemag.org/news/2019/12/it-s-nature-s-sports-drink-ants-live-urine-dry-australian-island

Sugar ants spend a night feasting on a urine stain on Kangaroo Island in Australia.

Wildlife ecologist Sophie Petit was camping on South Australia’s Kangaroo Island one night in 2016, when she noticed something unusual: sugar ants swarming a spot in the sand where she had urinated a couple of hours earlier. To her wonder, the ants came back, night after night, seeking more pee.