This would be my food chain:
Sun → Plant → Caterpillar → Bird → Weasel → Eagle → Mushroom
In my food chain:
The sun is the source of energy and provides energy to the plants.
The plant is the producer and provides energy to the caterpillar.
The caterpillar is the primary consumer and provides energy to the bird.
The bird is the secondary consumer and provides energy to the weasel.
The weasel is the tertiary consumer and provides energy to the eagle.
The eagle is the final consumer and when it dies it provides energy to the mushroom.
The mushroom is the decomposer and provides nutrients to the plant through decomposition.
Hope it helped,
BioTeacher101