The Mangaia kingfisher (Todiramphus ruficollaris) is classified as ‘Vulnerable (VU)’ in the IUCN Red List of Threatened Species. It is confined and endemic to Mangaia island in the Cook Islands. The population appears to be stable with numbers estimated at between 400 and 700 individuals. It inhabits makatea (raised limestone forest) and mature secondary forest and prefers to nest in coconut and barringtonia tree cavities.
The common myna (a href= http://www.issg.org/database/species/ecology.asp?si=108&fr=1&sts=&lang=EN>Acridotheres tristis) competes aggressively with the kingfisher for food and increases the likelihood of nest failure. Cats (Felis catus), Pacfic rats (Rattus exulans) and black rats (Rattus rattus) are potential kingfisher predators. In addition browsing goats (Capra hircus) and pigs (Sus scrofa) increase forest fragmentation and decrease forest regeneration, respectively.
(Source: BirdLife International 2012).