Answer:
Ground squirrels receive energy captured by the producers.
Step-by-step explanation:
Producers are placed in the first tropic level of an energy pyramid of an ecosystem.The green plants act as producers because they can generate their own food by the process called photosynthesis.
According to the diagram given in the question the ground squirrels are the organisms which receives energy captured by the producers.As a result ground squirrels act as primary consumers and they are placed in the second tropic level of the energy pyramid.