Tweeters,

A quick look online suggests that the highest wingbeat frequencies
during everyday activity for small hummers are around 78-80 Hz.
Reports suggest that in courtship frequencies reach 200 Hz. Large
hummers have substantially slower wingbeat frequencies.

The lowest note in the standard bass repertoire for opera is E2 (82.4
Hz) with the exception of a D2 (73.4 Hz) in the role Osmin by Mozart. A
number of basses do ornament with lower notes such as a C2 (65.4 Hz) or
even lower. So the lowest basses do have a note or two or three overlap
with the non-courtship range for small hummers.

During courtship wingbeat frequencies for small hummers reach within the
range of contraltos, tenors, baritones and basses (some basses having as
much as a dozen notes overlap with hummers).

Doug Will
UW