Put the plants on the bottom
Put the animals like grasshoppers above them
Put frogs right above them
Put snake above that one
Then put owl on top of that
Then you're done
See the plant always goes on the bottom while above that it's always the small critters or plant eaters that eat the plant
Then above that you would put the animals that would eat that plant eater
Then put a big predator above the little one then that's the food chain