Starfish are marine invertebrates. They typically have a central disc and five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operated by a hydraulic system and a mouth at the centre of the oral or lower surface. They are opportunistic feeders and are mostly predators on benthic invertebrates. Several species have specialized feeding behaviours including eversion of their stomachs and suspension feeding.
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進階授權 | WEL | 4096 x 4096 | JPG | 88 | |
進階授權 | UEL | 4096 x 4096 | JPG | 88 |
XS
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M
L
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標準授權 | 480 x 480 px | JPG | 13 點 |
標準授權 | 800 x 800 px | JPG | 15 點 |
標準授權 | 1732 x 1732 px | JPG | 18 點 |
標準授權 | 2236 x 2236 px | JPG | 20 點 |
標準授權 | 2828 x 2828 px | JPG | 22 點 |
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進階授權 | 4096 x 4096 px | JPG | 88 點 |
進階授權 | 4096 x 4096 px | JPG | 88 點 |