This video from New Zealand is called Chatham Island Pigeon (Parea) hopping – Chatham Island.
From Scoop in New Zealand:
Besieged bird species recovers
Wednesday, 19 August 2009
Scientists surveying endangered Chatham Islands parea (Chatham Islands pigeon) last week were were surprised to find that the population had increased to around 500, from a population low of 40 in the late 1980s.
Protection of their habitat through fencing, predator control and covenanting has reversed the decline of parea. The positive survey results could see its threat status being lowered when it is next assessed, Department of Conservation scientific officer Ralph Powlesland said. …
“It’s a 66 per cent increase in the past four years. We counted 234 birds in the core area of the forest (compared with 141 during the previous survey in 2005). When we extrapolated the information we collected over the full area of protection we realised the population was around 500.”
Predation of parea eggs, nestlings and adults by feral cats, and the degradation of some favoured parea food species, such as hoho (Pseudopanax chathamicus), through feeding by feral stock and possums led to a decline in parea numbers during the 1980s.
But their population increased dramatically over the next 20 years, after the forest was protected by fencing to exclude stock, possum and cat populations were controlled to low levels, and forest patches were covenanted by landowners; the Tuanui, Seymour, Holmes and Day families.
Crested pigeons sound the alarm with their wings. Specialized feathers produce high and low tones when the birds flee in a hurry. By Helen Thompson, 1:28pm, November 9, 2017.