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Gorillas' chest thumping allows females, rivals know their size without seeing them- Technology News, Firstpost
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Why do gorillas beat their chests? New research gives insight into behaviour of silverbacks | UK News | Sky News
Brian Lilly on Twitter: "Western Lowland Gorilla 'Kiondo' chest beating with four carrots in his mouth @PaigntonZoo #gorilla https://t.co/6rrK759pm7" / Twitter
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