Chlidonias niger Biometrics

Wingspan: 64 - 68 cm (Beaman & Madge, 2011)
Total length: 22 - 24 cm (Beaman & Madge, 2011)
Weight: 50 - 75 g (Hume, 2002)

Status

Madeira local status by Correia-Fagundes et al, 2021: Exceptional
Madeira local status by Romano et al, 2010: Exceptional
Madeira local status by Zino et al, 1995: Exceptional
Conservation status by the IUCN Red List Categories, 2016: Least Concern ver 3.1