One of the challenges often posed to the Biblical account of Noah’s Ark is that carnivorous animals could not survive without eating meat, and presumably the other animals on the Ark were off limits least an entire species (or “kind”) of animal get wiped out.
However, there is evidence for some carnivorous animals that we know of today that under certain circumstances, a vegetarian diet will suffice.
An example I just found is the spider, as written in this recent article from a non-Creationist science website, Sparkonit:
“Spiders occasionally prey on small vertebrates such frogs, lizards, snakes, fish, birds, and bats and sometimes even feed on plants.”
That is all.