BBC Life documentary always had an "On Location" at the end. Here are two examples.
One involves a lot of fake, they searched for a spot outside to observe and then rebuild the whole set indoor in order to be able to film growing of the plants [1].
In the other one they follow a dragon hunting a buffalo around for a long time trying best not to interfere [2].
But there is more, for one episode a cameramen built a shelter to hide himself from a bird. He had to improve it and stay for a long time to finally catch his footage. (Couldn't find it, sorry)