Atertiary consumer, such as a red-tailed hawk, receives what percent of the energy fixed by primary producers in a typical field ecosystem?

Assuming a 10% trophic efficiency, the herbivore (primary consumer) will get 10% of the producer energy. Then, the second consumer that eat the herbivore will get 10% of the primary consumer energy, so it is 10%*10%= 1% of the primary producers.
Then, the tertiary consumer should get 0.1% of the primary producers' energy.

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