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Birding/bluebird egg shells


Under a bluebird house where they had been nesting, we found remnants of two bluebird eggshells.  There were 3 approximately 1/2 shells and one crunched 1/2 shell.

We wonder if the eggs hatched and parents threw out the shells? If not, what kind of creature would leave about 1/2 of a shell intact?


There are often half shells left after babies hatch, but usually the parents take them away so as not to bring predator attention to the nest, so this might have been the result of an attack. As a Bluebirder you should be opening the box every week (until the young are 12 days old) so that you know when the eggs hatch, if there are any problems and when they are 12 days old. They will fledge at about 19 days and then the nest should be removed as they never go back. If you will send your mailing address to me at I will send you my free Bluebird book which will tell you all of this and make you an expert. See page 19 for why you should have more than one box. Good luck! Bluebird Bob Walshaw.


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Bluebird Bob Walshaw


I can answer almost any question on Eastern Bluebirds and small cavity nesters such as Chickadees, Titmice, Wrens, etc. Also general questions on other songbirds. No pet bird questions please. Send mailing address to me at for a free 20 page Bluebird book.


I have had a 100+ nestbox trail for more than 20 years, I do a lot of writing, public speaking and educational work in this field. My hands-on Bluebird talks include more than 1000 people each year.

Oklahoma Bluebird Society, North American Bluebird Society, National Audubon Society, Oklahoma Audubon Society, Oklahoma Fur Bearers Alliance

Bluebird Magazine, Oklahoma Today, Fur-Fish-Game, Birds & Blooms, Nature Society News,Back Woodsman Magazine, Tulsa World, Broken Arrow ledger, Teaching Tolerance magazine,Trappers World, OK Hole Story, Birders World

Degree in Mechanical Engineering, an MBA, Graduate of the Home Study Course in Bird Biology from the Cornell Laboratory of Ornithology, Oklahoma Master Naturalist. I am also a pofessional speaker and writer.

Awards and Honors
Chosen as a public speaker for the North American Bluebird Society, Bluebird trail accepted as part of the Transcontinental Bluebird Trail, Chosen as a panel speaker at the 2006 NABS Convention.

Past/Present Clients

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