thanks again @oldfangle. I hope to answer more of these questions upcoming posts about the day-to-day, but these are well habituated chimps that it's easy to observe. Here's a copy-paste of an earlier reply to a similar question
I don't get nervous following them because they are very shy and avoid us. We've habituated them to our presence, where we get to watch closely, but we are careful to say at least 7m away to keep them safe from our diseases. We don't interact with them, because any small interaction can lead to them wanting to interact more. Right now, they treat us like suspicious trees, which is a great thing for science and their well-being.