Answer: sheathbills

AnswerCrossword Clue
sheathbillsSHEATHBILL, either of two Antarctic seabirds having a white plumage and a horny sheath at the base of the bill
sheathbillsA mainly white pigeonlike bird with a horny sheath around the base of the bill, breeding on the coasts of sub-Antarctic islands and feeding by scavenging