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It appears the starfish is eating the periwinkle. These are often more of a ...
The most blue one I have ever come across. Most are more of a gray-blue
, including sea snakes, lionfish, flatfish, ...
, blunt spines. Most have five arms, but ...
four or six-armed specimens; they may grow ...
. Leptasterias hexactis has row of larger rounded spines running down each ...