As an extreme example, the Eskimos. Not that much vegetation up on the Arctic Circle, so their traditional diet is predominantly meat, fish, birds and bird eggs.
Add to that the populations of northern Siberia and the Laplanders whose diet and life support systems consist almost entirely of one single animal:
Rudolph!
Some limited fish and seal, but not much.
The reindeer are the only large animal that can eke out an existence from the lichens and very sparse vegetation.
They eat the plants.
The people eat the reindeer.
Years ago, after word got out that some Eskimos had killed a whale for food, some Vegans went to Alaska to try and talk the Eskimos to eat a vegan diet. They were laughted out of camp.