The possible function of stone ramparts at the nest entrance of the blackstart.  [electronic resource] 

 -  Animal behaviour  Jul 1998 
 - 207-17 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0003-3472 
<br/><br/><label>Standard No.: </label>10.1006/anbe.1998.0766  doi