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Dr. Universe: Why do some birds cheep loudly while other birds cheep quietly? -Traver, 4, Indiana 

That’s a great observation. Birds make all kinds of sounds and for lots of different reasons. When I got your question, I called up my friend Jessica Tir, a graduate student at Washington State University who studies songbirds. She said one of the main reasons a bird will make a loud sound is to attract a mate. When the birds find each other, they can make a nest for their eggs and wait for babies to hatch. Read More ...