Which hummingbird adaptation is most advantageous for supporting their high metabolism?

Hummingbirds use a great deal of energy because of their exceptionally high metabolism. Entering torpor temporarily lowers their metabolic rate and body temperature, conserving energy when food is scarce or overnight. A long beak and tubular tongue help them feed, but torpor most directly supports their high metabolism by reducing energy use.

AI-written and checked against the verified answer.