I was watering the other day and I realized that the old hibiscus tree that I've had for about 35 years, has a Robin nest in it! I usually put this plant outside in the summer and I've always wanted a bird to build a nest in it; but, that's never happened. This year, I just didn't get around to moving the tree outside. So, it remained on the bench, just about in the middle of the greenhouse. However, once it warms up here in the summer, I leave the back vent open 24/7 and this year a Robin pair decided to fly into the greenhouse and build a nest in my old hibiscus! So cool! The nest is at the tip of the blue arrow in the photos.