It must be. That's what our rose bushes are. Because for the third time this season, long after what I thought bird baby season was, we have blue robin's eggs in the nest in the back. That nest has been there for three years now, and we don't want to touch it. Well, after no visitors for weeks and weeks, a robin starting visiting, and yesterday there was one blue egg - and today there are two.
We will never be able to prune our rose bushes - but we're looking forward to some new babies in a couple of weeks.