Mangrove finch  (Camarhynchus heliobates)

With a declining population of less than 100 adult birds (3) and a breeding range of around one square kilometre (5), the mangrove finch’s situation is critical. The exact cause of this species’ decline is unclear, but, natural factors such as the El Niño cycle, introduced species, and human activities may all be involved (2). As a result of introduced predators such as black rats, cats and the smooth-billed ani preying on eggs and chicks, and high levels of nest infestation by the blood sucking parasite, Philornis downsi, causing the death of nestlings, the mangrove finch’s breeding success is low (2). Concerted conservation action is necessary if this species is to be saved from extinction.

For over a decade, the Charles Darwin Foundation (CDF) has been working to conserve the mangrove finch (2). At present, extensive research is being conducted to better understand this species’ breeding biology and to determine the causes of its decline (2) (5). In the meantime, active protection of the remaining breeding populations is being employed through predator and nest parasite control (5). Despite these measures, the mangrove finch remains extremely vulnerable due to its limited range. In order to address this, the CDF and the Durrell Wildlife Conservation Trust are currently working together towards a captive breeding and translocation programme. If successful, their efforts will help to ensure a future for this remarkable species (5) (7).