A tawaki equipped with an underwater camera mounted on its back captures a selfie in Milford Sound. PHOTOS: SUPPLIED : Camera-equipped tawaki surprise researchers

A tawaki equipped with an underwater camera mounted on its back prepares to dive in front of Bowen Falls. : Camera-equipped tawaki surprise researchers

A tawaki equipped with an underwater camera swims past another bird as it forages in Milford Sound. : Camera-equipped tawaki surprise researchers