The low hum you'll hear below isn't an old plane struggling to get airborne or the rumblings of a giant. It's actually the sound of gorillas eating.
A recent study by WCS and the Max Planck Institute for Ornithology says that gorillas "sing" and "hum" while they're having a meal and that it's the adult males that are the noisiest. The researchers suggest this could be to coordinate eating time.
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