Here's another food chain, with a few more animals. It starts with acorns, which are eaten by mice. The mice are eaten by snakes, and then finally the snakes are eaten by hawks. At each link in the chain, energy is being transferred from one animal to another.
There can be even more links to any food chain. Here another animal is added. It goes
Grass to grasshopper to mouse to snake to hawk.
There is actually even more to this chain. After a hawk dies, fungi (like mushrooms) and other decomposersbreak down the dead hawk, and turn the remains of the hawk into nutrients, which are released into the so The nutrients (plus sun and water) then cause the grass to grow.
It's a full circle of life and energy!!