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Gorillas' chest thumping allows females, rivals know their size without seeing them-Tech News , Firstpost
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Why Do Gorillas Beat Their Chest? Experts Uncover How They Use it as a Key Signal | Nature World News
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Why do gorillas beat their chests? New research gives insight into behaviour of silverbacks | UK News | Sky News
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Gorillas don't bluff when they chest beat: honest signalling indicates body size | Max-Planck-Gesellschaft
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Terrifying moment huge raging gorilla charges tourists forcing them to flee as he beats his chest | The US Sun
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Mountain Gorilla silverback beating chest, Parc National des Volcans, Rwanda | Mountain gorilla, Gorilla, Eastern lowland gorilla
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