I want to know the answer to the following question:
What species did the elephants at the Gash River seem to form a symbiotic relationship with?
All the background I'm provided with is that "The elephants seemed to have formed a symbiotic relationship with olive baboons, with the baboons using the water holes dug by the elephants, while the elephants use the tree-top baboons as an early warning system.". Is that enough to answer the question?