Plural of bighead; multiple arrogant people, or multiple fish of the bighead species.
Plural formation of 'bighead' using regular English pluralization (-s). Maintains the same etymological roots as singular form.
Bigheads as a fish category includes the silver carp and black carp, which are invasive species in North American waterways—they've become such a problem that commercial fishing efforts exist specifically to manage them, yet most people don't know these 'bigheads' are silently transforming aquatic ecosystems.
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