What is "adzebill"

n. Either of two bird species of the extinct family ''(taxlink Aptornithidae family noshow=1)'', once endemic to New Zealand.

The adzebills, genus Aptornis, were two closely related bird species, the North Island adzebill, Aptornis otidiformis, and the South Island adzebill, Aptornis defossor, of the extinct family Aptornithidae. The family was endemic to New Zealand.