Found this, which I hadn't seen before, but looks to be a popular repost.
this post was submitted on 30 Jun 2024
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Owls are birds of prey, so they only eat meat. This can include insects, butterflies, snakes, fish, skunks, porcupines, rabbits, and whatever other small animals they can lift.
They can't chew, their tongues just work like a conveyor belt to pull things down to be digested, so they can't really eat a wide variety of things, and they don't have a crop to break down fruit/vegetable matter or seeds like other birds.
You will find people online of course saying they've seen an owl eat this or that. Owls are goofy like most animals and will chew on things to check them out when they are bored, but I don't see any accounts of them eating anything but meat for sustenance. All the rescues give them various birds and rodents and that's it. They don't even need to drink as they get all the water from their prey, though again, they will drink if they're hot or bored or while taking a bath.
That tracks.
Cats are purely carnivorous. And yet we've had cats who'd regularly eat:
The lettuce thing was a kitten phase; she stopped doing it as she got older. Potato chips and popcorn are "cheat" foods; most of the chips we eat have MSG, which is the "meat" flavor, and we put seasoning with MSG and nutritional yeast on our popcorn, so they probably think they're getting meat. I've read many cats like cantaloupe; something in it tastes like meat, and it's pretty common. Grass, well... I don't know. Supposedly they eat it as an emetic, but this one just gnoshes on it and never throws it up. We have to keep a small lawn in the house for him; he's just a weirdo.
The Hershey's Kisses thing was odd. I know chocolate is toxic for cats, and we'd try to keep it away from him, but he'd find the bowl wherever we put it, pull one with carefully unwrap it, and eat the chocolate. He'd eat one or two at a time, and never seemed to suffer any ill effects from it. We'd re-hide the bowl, and when we discovered the wrappers around the house we knew he'd found it again. It was only around Christmas; Kisses in a bowl at Christmas was something my wife was brought up with. Anyway, strange cat.
Oh! We had another who'd dig through the trash for fast food wrappers and eat them. The paper. I think that's because he was an older adoption and had lived on the streets and learned to live out of trash cans, though.
This has nothing to do with owls, but there's a pure carnivore parallel and it makes me wonder. Are there owl individuals who pick up a taste for something omnivorous somehow?
I've had a few cats that enjoyed snacking on random things as well. The sky cats/land owls comparison contintues!
My cats have enjoyed green beans. They all definitely liked chips. The one cat loved that cat grass you can buy to grow your own. My parent's cat liked powdered donuts. I don't think any ate fruit. One I saw eating macaroni salad and corn on the cob when she was a stray.
I couldn't find much discussion on owls eating odd things, but there was a redditor that started pictures of a GHO eating acorns, which sounds very strange. I'm thinking it would just throw them up later. Owls have very weak digestion, and they'd be too big to get past the gizzard.