These two are intense hunters, there is not a 'fishing' worm safe for now. They turn over rocks, they tear through moss, they tip over downed branches. Anywhere they think there might be a bit of dinner, they are going to go through it.
I haven't seen a nest in the tree, but the tree is pretty large. When the weather gets a bit more dry, I might set a chair in the yard and watch, and see if I can spy where they go to. I must say, they seem pretty laid back about the chickens, they stay out of the yard.
When they come up to the fence and Longtail gets all aggressive, crowing and sticking his head up to the fence in challenge, they will turn and look at him like, "Really?", then go right back to digging bugs and worms. Longtail hasn't gotten the hint yet...
(Oh, and I did name them Heckle and Jeckle, but found out, a) Heckle and Jeckle are Magpies, not Crows, and b) they were both boys, hence the "ette"... Meh, can't win 'em all...)