"How big is an owl pellet?"
Like most answers in nature, it depends!
First it depends on the size of the bird in question. A small owl will naturally have a smaller pellet.
But it also depends on how much casting material (fur, feathers, and bones) they consume. A large owl might pass a small pellet if they had a small meal. Or they might have a massive pellet after a feast.
I was amazed to find a huge pellet in our Great Horned Owl's mew. It was about twice the size of his normal pellet! Otto had received a whole rabbit head as a treat the day before, and that extra-large meal created an extra-large pellet.
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