 Several terrestrial starlings , including those in the genus Sturnus , have adaptations of the skull and muscles that help with feeding by probing . This adaptation is most strongly developed in the common starling ( along with the spotless and white @-@ cheeked starlings ) , where the protractor muscles responsible for opening the jaw are enlarged and the skull is narrow , allowing the eye to be moved forward to peer down the length of the bill . This technique involves inserting the bill into the ground and opening it as a way of searching for hidden food items . Common starlings have the physical traits that enable them to use this feeding technique , which has undoubtedly helped the species spread far and wide . 
 Several terrestrial starlings , including those in the genus Sturnus , <a href='got' title='1'><mark>have</mark></a> adaptations of the skull and muscles <a href='null_relcl' title='2'><mark>that</mark></a>help with feeding by probing . This adaptation is most strongly developed in the common starling ( along with the spotless and white @-@ cheeked starlings ) , where the protractor muscles responsible for opening the jaw are enlarged and the skull <a href='drop_aux' title='3'><mark>is</mark></a>narrow , allowing the eye to be moved forward to peer down the length of the bill . This technique <a href='uninflect' title='4'><mark>involves</mark></a> inserting the bill into the ground and opening it as a way of searching for hidden food items . Common starlings <a href='got' title='5'><mark>have</mark></a> the physical traits <a href='null_relcl' title='6'><mark>that</mark></a>enable them to use this feeding technique , which <a href='been_done' title='7'><mark>has</mark></a> undoubtedly helped the species spread far and wide . 
Several terrestrial starlings , including those in the genus Sturnus , got adaptations of da skull and muscles help w feeding by probing . This adaptation is most strongly developed in tdacommon starling ( along with the spotless and white @-@ cheeked starlings ) , where the protractor muscles responsible for opening thdaaw are enlarged and the skull narrow , allowing the eye to be moved forward to peer down thedangth of the bill . dis technique involve inserting the bill into the daund and opening it as a way of searchin fir hidden food items . Common starlings got the pdaical traits enable em to use this feedin technique , which done undoubtedly helped the spdaes spread far and wide .