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The walking-fish or mud-skipper (Periophthalmus)

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The walking-fish or mud-skipper (Periophthalmus).jpg molars of elephantsMiniaturesThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquairmolars of elephantsMiniaturesThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquairmolars of elephantsMiniaturesThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquairmolars of elephantsMiniaturesThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquairmolars of elephantsMiniaturesThe oldest fossil fish known—discovered in the Upper Silurian strata of Scotland, and named Birkenia by Professor Traquairmolars of elephantsMiniaturesThe 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.