In 2008, Ulrike spent two weeks on the top of Mt. Mulu in Sarawak, Malaysia, as part of an international team investigating one of the most amazing plant-animal mutualisms ever! High up in the cloud forest, mountain tree shrews visit the pitcher traps of Nepenthes lowii to collect nectar. They then use the pitchers as a toilet - yes, you read that right! - and leave their nutrient-rich droppings in exchange for the sweet treat (photo by Katja Rembold).