Pacific sand crab
... that although the Pacific sand crab can only crawl and burrow backwards , it can also tread water?
... that although the <b id="mwDbk"><a href="./Emerita_analoga" id="mwDbo" rel="mw:WikiLink" title="Emerita analoga">Pacific sand crab</a></b> can only crawl and burrow backwards <i id="mwDbs">(pictured)</i>, it can also <a href="./Treading_water" id="mwDbw" rel="mw:WikiLink" title="Treading water">tread water</a>?