pellets
...that the pellets regurgitated by some predatory bird species have been found to contain bird bands once attached to their prey?
...that the <b id="mwBQQ"><a href="./Pellet_(ornithology)" id="mwBQU" rel="mw:WikiLink" title="Pellet (ornithology)">pellets</a></b> <a class="mw-disambig" href="./Regurgitation" id="mwBQY" rel="mw:WikiLink" title="Regurgitation">regurgitated</a> by some <a href="./Bird_of_prey" id="mwBQc" rel="mw:WikiLink" title="Bird of prey">predatory bird</a> species have been found to contain <a class="mw-redirect" href="./Bird_band" id="mwBQg" rel="mw:WikiLink" title="Bird band">bird bands</a> once attached to their prey?