Since the raft is covered with a tent, you can get reasonably close to the animals without being recognised as a human, and in this way you do not disturb them.
In the first photo, yours truly, dressed in a neoprene suit, is standing at the edge of the pond, where it is obviously not very deep yet. Also visible is the business end of my 600mm f/4 FL, with a z9 hanging somewhere behind it.