Because they're
Happy.. Happy..Happy!!
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Maybe they will mellow out as they are pretty aggressive little suckers!

Because they're
Happy.. Happy..Happy!!
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Because if they did anything else, they wouldn't be called HUMMING birds.
Just asked a Yellow Bellied Sap Sucker the importance of living up to one's given avian name.
I knew a girl could hum with ice cubes in her mouth. Weird girl.