One of the folks I work with posted these pictures and the following write-up on our bikes mailing list. Normally when you hear of folks interacting with nature on a bike ride it's something like a mountain biker avoiding a snake, or a road rider barreling into a deer or bear on a descent. It had to be pretty amazing to witness something like this first hand:
"Koalas are not social and don't come out of trees very often. They don't normally drink water at all. All their food and water comes from the eucalyptus leaves that they eat. That's why they sleep about 22 hours of the day. Their caloric and liquid intake is not enough to keep them awake more than a couple of hours. But Australia’s major drought has changed all that."