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In 6/8 time, there are 2 beats per measure, and one dotted quarter note has one beat. In 9/8 time, there are 3 beats per measure, and one dotted quarter note has one beat. In 12/8 time, there are 4 beats per measure and one dotted quarter note has one beat. In 6/16 time, there are 2 beats per measure and one dotted eighth note has one beat. Etc. Another way to extend the duration of a note is by using the tie.
You can tell how fast a hummingbird beats its wings by measuring the pitch of the humming noise. There are numerous recordings and videos of hummingbirds on the web, and the pitch of the hum of ruby throated hummingbirds measures at 40 - 60 cycles (= beats) per second.