Too cold for Decorah's bald eagles?

Decorah's latest cold spell comes at an inopportune time for the Decorah bald eagles.  The first eagle egg of the season was laid on Sunday afternoon.

Raptor Resource Project Bob Anderson says the bald eagle pair have never before incubated eggs in weather this cold during his eight years capturing the eagles on camera.

Anderson says there's a chance the eggs could freeze, killing the embryos. He tells decorahnews.com that this happened last year with an Eagle Cam in Minnesota with temperatures that were milder then than what Decorah is experiencing now.  
  
But Anderson also sees reasons to be optimistic.  He says the eagles did bring some grass into the nest just before the weather turned colder, which should keep the nest warmer.  And the mother and father eagle often have taken less than a minute to exchange places over the egg, reducing the time the egg is exposed to the bitterly cold weather.