Broodies are fierce! My black australorp stomped around with her wings up in the air, growling (or the chicken equivalent) when other chickens came near her babies. She was so protective of them. Then one night when they were five weeks old she up and left them- went to roost with the older hens. If there were any goodbyes I didn't see it - it was like a switch turned off and she wasn't "mom" anymore. Sort of sad :/