A small colorful bird from tropical regions, also known as a manakin.
From Tupi or Arawakan language of South America (the indigenous language family). The word 'guitguit' is onomatopoetic, imitating the bird's call, which is common for bird names from tropical regions.
The guitguit's name mimics its own call perfectly — it sounds like 'guit-guit' — and this kind of onomatopoeia in animal names is especially common for birds and insects that early Europeans encountered through indigenous peoples who'd already named them by sound.
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