The difference between Birdshit and Guano
When used as nouns, birdshit means avian excreta, whereas guano means dung from a sea bird or from a bat.
check bellow for the other definitions of Birdshit and Guano
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Birdshit as a noun (vulgar):
avian excreta; guano
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Guano as a noun:
Dung from a sea bird or from a bat.