Reminder to watch for capped eggs on nest checks

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Dave Duit
Posts: 1796
Joined: Tue Nov 25, 2003 2:02 pm
Location: Iowa / Nevada
Martin Colony History: In 2020, 60 pair with 285 fledged youngsters. 83 total cavities available, 58 Troyer Horizontal gourds and 4 modified deep trio metal house units, 1 fallout shelter, owl cages around all units. Martin educator and speaker. President and founder of the Iowa Purple Martin Organization. Please visit and join.

Hey everyone,
I realize that most landlords are already aware of keeping an eye out for capped eggs during weekly nest checks. For those that are new to being a martin landlord, a capped egg is an egg that has a half egg shell covering half of an egg. When the babies hatch, there is a small chance that half of that egg shell will fall over onto the top of another unhatched egg. It is unlikely that the unhatch baby will be able to break through this double layer of shell. If you find a capped egg in the nest, gentle remove the half egg shell from the unhatched egg. Be delicate is an understatement.
Mite control, heat venting, predator protection and additional feeding during bad weather add up to success.
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