Natural sounds include animal sounds, from the chirruping of crickets to the vocalisations of mammals. They also include the sounds of other natural phenomena, such as water sounds; for example, the sound of rain falling on the ground or on water, the sound of a waterfall, a rushing river, waves lapping or rolling gravel on a shoreline; and wind sounds, such as the murmur of wind rustling the leaves in trees, the howling during a gale and the roar of a whirlwind. Water and wind sounds are often heard in combination in nature. Other natural non-human sounds are thunder, the crack of large pieces of ice shearing from a glacier or iceberg, and the crackle of a forest fire. Such sounds may have contributed to the development of prehistoric music, and have important cultural references nowadays.
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