Thomas the blind, bisexual goose, who spent his later years in a bizarre love triangle, has died.

Thomas made a name for himself with residents at Waimanu Lagoon in Waikanae on the Kapiti Coast, where he lived for three decades.

The 40-year-old segregated himself from other geese in the area and instead chose a male black swan named Henry as his life-long mate.

Henry and Thomas spent 24 happy years together, before a female black swan named Henrietta flew into the lagoon.

Henry and Henrietta paired up and, making up for lost time, had dozens of cygnets together over six years.

But Thomas couldn't move on and became the third wheel in the relationship, acting as uncle to Henry and Henrietta's cygnets.