CLOSED: Where do the egg shells go after hatching?

I watched and documented a nest of Northern Mockingbirds in June 2011. The attached picture is from June 8, 2011 when three of the four eggs hatched. During the entire time of monitoring this nest and taking multiple pictures every day, I never saw any of the egg shells. What happened to them? Do the adult birds eat them? I've examined every one of my 309 photos, including the empty nest after the birds had fledged. There were never any shells or shell fragments on the lawn or in the nest. Does anyone know what the Northern Mockingbird does with the shells after the babies have hatched?

The female often eats the eggshells, to replace the calcium used to make them in the first place. Otherwise, the parents will fly off to dispose of them a long way from the nest; the white inside of a shell is conspicuous, and if left near the nest might attract predators.

Resin

Thank you so very much for the information, Resin. The Northern Mockingbird is certainly a very intelligent bird.