No one is sitting on the eggs or young. Won’t they get cold?

It is normal for parents to leave the eggs and nestlings every so often. The mother rarely stays away long enough to cause harm. Both great horns and ospreys are able to successfully incubate the eggs in extremely cold weather, and great horn eggs have been recorded to withstand parent absence of 20 minutes at -13 degrees.

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1. Do great horned owls and ospreys mate for life?
2. No one is sitting on the eggs or young. Won’t they get cold?
3. How come one egg of the clutch hasn’t hatched when the others have?
4. Which parent sits on the nest?
5. Why is the bigger chick picking on the little one?
6. Are the birds in danger of freezing to death on cold nights?
7. Why is the bird standing on one leg?
8. Do you ever intervene if one chick is not doing well?