rabbits, hares and pikas
... that the incisor teeth of rabbits, hares and pikas continue to grow throughout their lives?
... that the <a href="./Incisor" id="mwDak" rel="mw:WikiLink" title="Incisor">incisor teeth</a> of <b id="mwDao"><a href="./Lagomorpha" id="mwDas" rel="mw:WikiLink" title="Lagomorpha">rabbits, hares and pikas</a></b> <i id="mwDaw">(European rabbit pictured)</i> continue to grow throughout their lives?