It could just be that she sees birds as prey, and does not see smaller mammals as prey. Or it could be that she's "growing up" and becoming more confident, as you say. It could really be any number of things that motivated her to chase the bird while being previously scared of other small animals -- maybe the way it moved, looked, or smelled, or maybe she just got a wild hair. We can never know for certain why they do everything they do. I don't think it's uncommon for dogs to be scared of the robotics though. =P
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