A great article just out by Anna Marzec (University of Zurich) and Tuanan Orangutan Research Station researchers, including CORE Borneo Co-Director Erin Vogel. Lethal aggression between female orangutans? Male-female coalitions? Check this out!
http://link.springer.com/article/10.1007/s00265-015-2053-3
CORE BORNEO 