I wouldn't wish to argue with the Smithsonian but - but - but

There is no such thing as an ecosystem where all animals are carnivorous predators! Somewhere at the bottom of the food chain there has to be a huge preponderance of vegetable eating prey!

https://www.smithsonianmag.com/blogs/national-museum-of-natural-history/2023/04/05/smithsonian-scientists-discover-one-of-the-earliest-mammal-ancestors-that-ate-its-veggies/