The Nest (1987)
ROACHES HAVE NEVER TASTED FLESH.. UNTIL NOW. SHE'S JUST AN APPETIZER.
A biological experiment goes haywire when meat-eating mutant roaches invade and terrorize a peaceful New England fishing village and hideously butcher its citizens.
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Roaches have never tasted meat
I'm pretty sure they are omnivores and eat whatever, including meat.
Whoever designed that movie poster is a visual genius.
A fun when-mutated-nature-attacks flick with excellent practical effects work.