
Originally Posted by
John Chardine
Not exactly relevant but-
in Antarctica, friends and colleagues have done quite a bit of work on the effects of tourists visiting penguin colonies. Studies looked at behaviour, nest success and even adult heart rates as measured by a "dummy" egg added to the nest. The results show that although the heart rate of the incubating bird goes up when people approach to with 5m of the nest (it also goes up when a skua flies over), this does not translate to lower nest success. The particular study in question was BTW published in Nature.
The big "but" here is that as mentioned earlier, species and species groups differ widely in their tolerance to disturbance so it is not easy to extrapolate beyond.
I am photo editor for our Maritimes Breeding Bird Atlas, and our policy is not to accept images of birds at the nest. It is "better to be safe than sorry" in these cases.