Yes they do but not from the non-weeping variety. Lucy has been eating these leaves daily for years. I don't think there's a leaf on the entire tree without a bite out of it! She doesn't like it when the boys climb "her" tree and let's them know it!That looks amazing! I would want to live there!
I'm a huge plant lover myself. Witch is not a great combination when taking care of birds. But I always look up de toxicity level. And I believe that they make aspirin from willow trees and can be poisonous. I don’t know if this is the same species, so I could be wrong. Just wanted to let you know what I found.