A moth was spotted drinking a sleeping bird’s tears in the Amazon jungle in Brazil, the first time this behavior was reported in the country and only the third known case worldwide.

Moths and butterflies have often been observed feeding on the tears of crocodiles, turtles, and mammals. It’s thought to be a way of obtaining salt, an essential nutrient that isn’t present in nectar and can be hard to find elsewhere.

Birds’ tears may be targeted for the same reason. However, the area where the latest case was witnessed is flooded annually by a nearby river and the water soaks up lots of salt from the soil. Since salt is readily available, Leandro Moraes, who made the recent discovery