| http://www.w3.org/ns/prov#value | - Eurasian Bittern male???s most commonly call is often given at dusk and dawn, and it is a characteristic slow, deep, resonant and far-carrying booming, and preceded by 1 to 3 short cough ???up-RUMBH??? or ???up-up-RUMBH???, repeated 3 to 4 times.
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