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The walking-fish or mud-skipper (Periophthalmus)

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The walking-fish or mud-skipper (Periophthalmus).jpg The wonderful draught of fishesThumbnailsThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor TraquairThe wonderful draught of fishesThumbnailsThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor TraquairThe wonderful draught of fishesThumbnailsThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor TraquairThe wonderful draught of fishesThumbnailsThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor TraquairThe wonderful draught of fishesThumbnailsThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor TraquairThe wonderful draught of fishesThumbnailsThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquair

It skips about by means of its strong pectoral fins on the mud-flats; it jumps from stone to stone hunting small shore-animals; it climbs up the roots of the mangrove-trees. The close-set eyes protrude greatly and are very mobile. The tail seems to help in respiration.