[5] They were common in the 1870s but habitat destruction and predation by mammalian invasive species reduced the population to only 40 birds by 1990.

Since then, predator control and stock fencing in and around the Tuku valley have resulted in improved breeding success which has led to rapid population growth.

[5] Traditionally considered a subspecies of the kererū, it was proposed in 2001 to be distinct enough to be raised to full species status.

Unlike the kererū, the Chatham Islands pigeon has an enlarged hind toe which helps it to scrabble about on the forest floor.

The Chatham Islands pigeon is renowned for their spectacular flying dives, especially by the males, to attract a mate.