The impala and baboons enjoy an interesting symbiotic relationship. When you visit Singita Grumeti Reserves you’ll seldom find one without the other.
Image courtesy of zrim (http://farm4.static.flickr.com/3104/2761905984_fa0e144804.jpg)
The baboons are, by their very nature hyper vigilant and therefore if they think anything is amiss they alert the impala. The impala are not as vigilant but while they graze they stir up all the insects and bugs. This makes it significantly easier for the baboons to catch their meals.
The impala are responsible for catering while the baboons handle the security detail.