Here is a picture of the Tree Swallow that watches over the nest from a distance and will fly into the nest often during the day.
The picture of the egg and nest is not the best picture. You have to imagine looking down the nest tube. The nest is bowled to the outside and may only be a 1/2″ in height. Bowled to the outside of the tube.
And yes you are right about the white egg as I have had them before.
