I wonder if the RES have a higher commitment to the nest than do BG. My experience is that they will demonstrate considerable devotion to guard duty, going beyond the lengths commonly displayed by our BG. In the early stages such as nest construction, they do appear to fluctuate somewhat, moving in and off the site as water temps and/or rain events interrupt their activity, but once established and "on" the nest, they tend to stay put, even when the BG are more easily disrupted.
Anyone else?
