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OK thank you. It has been quite cold here so insulation is understandable.
You don't have to worry about it! Note the white fluffy material the birds added... what I meant was that the construction itself is insulated.
How would I go about doing this? What should I use?
Nest construction reveals the need to provide warmth to the clutch.
Lat: 42.79, Long: -87.80
Spotted on May 17, 2015 Submitted on May 17, 2015