Student Birder

I live in Alaska. We have a lot of crows but,  I think many more ravens. This may come out in later sessions but the ravens here mimic an incredible variety of sounds, mimicking it seems not only other birds but other animals.  But with respect to the current lesson, is there any data on nest predation by cats (feral or domestic).  I thought that domestic cats roaming outside were an issue with bird predation in general.