a young or nestling owl
Collins English Dictionary - Complete & Unabridged 10th Edition
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For example, they tested the cats' response to a novel object, a plush owlet left on the floor.
Without the parents' protection many an owlet falls prey to a fox or jaeger or wanders off and dies.
The owl hatched and fledged one owlet and the eagles hatched and fledged one eaglet.
On closer inspection, it proved an owlet, wide awake and blinking at us from beside a concrete step.