Re- Observer impact on birds

On the subject of observer impact on birds, Richard Major wrote an 
interesting piece: 
R. E. Major. 1990. The effect of human observers on the intensity of 
nest predation. Ibis 132, 608-612.

He compared the predation rates on nests visited daily with those 
only visited once, and found significantly higher predation rates for 
the daily-visited nests. 

A number of people have argued one way or another on the subject, so 
it is quite a hot issue and by no means resolved , but important to keep
 in mind when studying birds. 

Lainie Berry
Department of Biological Sciences, 
Moansh University Clayton Vic 3168