1. They may kill song bird nestling but other animals are a lot worst like squirrel, racoon and some species of insects.
3. American crow live in large number of individual mostly compared to raven which is not living in large number.
2. In coming days I will get out and try to find a american crow nest.
4. Insects and scavenger animal when American crow leave a carcass of a dead animal.
Note: sorry for my english .