How is the color of eggs related to the nesting place of birds?

In most of the birds, the egg shell is brownish or greenish in color, and is also covered with dark dots, specks, spots. This color perfectly hides eggs from various predators. Therefore, this is the color of eggs in birds whose nests are open and located on top – eggs are in sight. But in birds, whose dwellings are located in hollows or burrows, eggs do not need protection, for this reason they remain white. The plus of the white color is that the bird can see its eggs in the twilight of the nest.