Which physical feature unique to horse mackerel serves as a natural defense mechanism against predators?
Answer
Seven thin spines located on the lower belly
Horse mackerel possesses a distinct physical characteristic on its lower belly area that functions as an evolutionary adaptation for defense against predatory species. This mechanism consists of seven thin spines embedded in that lower section of the fish. While the fish also has other notable features, such as two dorsal fins and a pronounced jaw, the presence of these specific seven spines is cited as the unique natural defense structure mentioned when describing its physical attributes.

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