Chickadees nested in my birdhouse and started laying eggs. Yesterday afternoon I saw two broken eggs on the ground. I haven't seen them in a couple of days. I think sometimes they take a break and don't return for a while so that would be normal but I'm wondering if they've abandoned the nest. What if only some eggs failed or were somehow broken and others remained? Will they abandon the nest? Will they try another unused birdhouse that's 15-20ft away? I've read that if a brood fails, they will not use that birdhouse or place again. That would be very disappointing.