1. Inbreeding could lead to a higher rate of genetic disease? Less ability to adapt?
2. I guess extra-pair fertilization is not that surprising to me, but I'm wondering about the timing. Would the female crow lay eggs at different times? It could be beneficial in that there would be greater genetic variation in the young.
I was surprised that they were able to take track of individual crows for up to two decades, that they understood the family ties between crows and that they could find family members still flocking together (such as sisters two years apart).
1. I would mention that snakes and even squirrels are responsible for more predation.
2. We have many American Crows in our neighborhood, but I have never thought to look for a nest.
3. I live where both species are present.