I made this list of my IUCN Red List Critically Endangered (CR) Birds in a similar topic at https://forum.inaturalist.org/t/most-endangered-birds-youve-seen-as-of-august-2021/25981/5
Regent Honeyeater (Anthochaera phrygia)
Ruppell’s Griffon (Gyps rueppelli)
Hooded Vulture (Necrosyrtes monachus)
White-headed Vulture (Trigonoceps occipitalis)
Waved Albatross (Phoebastria irrorata)
Black Stilt (Himantopus novaezelandiae)
I am not sure the status of each is still the same.