| http://www.w3.org/ns/prov#value | - Because of nighttime atmospheric inversions??? warmer air lying over cooler air??? the elephants' low-frequency calls are effectively trapped, traveling up to 10 kilometers (6.2 miles) instead of only a few during the day. (Higher frequency calls would not go nearly as far.) The best calling time is an hour or two after sunset, when the wind is low and an inversion has had time to develop.
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