There were two days between all nestlings hatching, with the first hatched visibly larger. While fledging this jumbo fledgling hogged the entrance hole. A determined sibling, ready to fledge pushed and shoved, and finally squeezed underneath the entrance hog, making double decker fledglings. The smaller fledgling continued its mission and managed to shove the larger sibling out the hole with itself right under it. I’ve seen many birds fledge but this was the funniest, and one that I will always remember.