American Robin nest success rate?
Posted 18 June 2012 - 06:16 PM
2 nest had a 75% success rate. One nest only ever had 3 eggs and the other nest the fourth egg never hatched.
4 had a 50% success rate. All four had two unhatched eggs.
1 had a 0% success rate. The nest got blown out of the lilac bush.
There is an eighth nest that I can see but I haven't been able to look inside to count the eggs or the young so I excluded that from this data.
So my question is, what is the normal nest success rate for Robins?
Posted 18 June 2012 - 06:27 PM
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Posted 18 June 2012 - 06:57 PM
Posted 19 June 2012 - 05:31 AM
Posted 19 June 2012 - 11:13 PM
Posted 20 June 2012 - 05:21 AM
Wikipedia sources a reference with: "Bird banders have found that only 25% of young Robins survive the first year."
And they're talking about the ones they've banded. Many never even make it that far. I'll bet from the point of hatching, it's more like 10-15%.
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