11. Benny uttered cordially, making the humming sound that is to llamas what barks are to dogs. 12. If spun correctly it makes a humming sound . 13. The real answer : Because they flap their wings so fast, it makes a humming sound . 14. At the firehouse they discover a third firefighter, Tony Diaz, who can hear a strange humming sound . 15. The humming sound of the tuning fork could be heard when the watch was held to the ear. 16. It is named the " Hummer " by locals due to a distinct humming sound it makes while feeding. 17. They detect a strange melodic, humming sound , which soon can be recognized as the song Solty learned from Rose. 18. "Hear that ? " she said of the humming sound vibrating from her old VCR . " Time to go. 19. Acoustic telegraphy devices were electromechanical and made musical or buzzing or humming sound waves in air for a few feet. 20. Along with for-sale signs on front lawns, the venting systems, which emit a humming sound , have become a fact of life.
