"This pair is doing a nest exchange. Female #46-07 DAR is on the nest about to sit down. Her mate is #402, now feeding. Both parents help incubate the eggs, which take a month to hatch. Every 15-20 minutes or so, they also do egg rolls, using their beaks to turn the eggs over. Nest exchange times vary, but from what I have seen, are conducted every couple hours or so."

Image: Eva Szyszkoski, ICF