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Infertile Egg

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Eye-spy:
Hmmmm....

Almost sounds like you need some kind of Security Camera Controller Recorder thingy on the nest, just in case.  Any recorded instances of egg theft ?

The Peregrine Chick:
Don't know for sure how they know, but I think it has something to do with the weight or rollability (yes, I know that isn't a real word) of the egg on their feet.  Think about how an hard-boiled egg spins vs a raw egg.  Not sure where I heard that but I'm definitely going to go back and find out now.

And not all birds know when one of their eggs are infertile.  And if the last egg is infertile, they are usually so busy with the chicks that did hatch that they don't get rid of the last one until later, if at all.  We haven't had too many infertile eggs and I've only ever pulled two out of one of our nestboxes (those would be last eggs).  Princess and Trey have removed an egg before.  Down in Lincoln, Nebraska this year, three eggs went missing and might well have been infertile eggs removed by the parents but know one knows for sure.  The last egg in their nestbox however was abandonned by the adults and was retrieved by the state biologists.

This was a great question, I'll let you know if my memory is faulty ...

Mrs. Martin Grade 6:
How do falcons know if an egg is infertile? Will they always remove it from the nest?
Mrs. Martin's Grade 6 Class

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