The plural of 'gekko', referring to members of the gecko lizard family or fossil geckos from prehistoric times.
From Latin 'gecko' or 'gekko', which itself derives from a Malay onomatopoeia 'gekoq' or 'gekak', supposedly mimicking the sound these lizards make. The scientific naming follows Latin pluralization conventions.
The word 'gecko' comes from an onomatopoeia—ancient Malays literally named the lizard after the sound it makes, which is why it's one of the few animal names that's basically a sound effect!
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