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In page Echis:
"All members of this genus have a distinctive threat display, which involves forming a series of parallel, C-shaped coils and rubbing them together to produce a sizzling sound, rather like water on a hot plate.[1][2] The proper term for this is stridulation.[3] As they become more agitated, this stridulating behavior becomes faster and louder. This display is thought to have evolved as a means of limiting water loss, such as might occur when hissing.[2] However, some authors describe this display as being accompanied by loud hissing.[3]
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