#procellariiformes

Spectacled Petrel (Procellaria conspicillata), family Procellariidae, order Procelariiformes, found in the far South Atlantic

Nests only on an inaccessible island in the Tristan da Cunha islands.

A female Northern fulmar (Fulmarus glacialis) with her chick nesting in Flatey, Iceland

Annoyed by others? Need your own space? Take a page from the snow petrel's book, and vomit! Adults, particularly nesting adults, will upchuck a special kind of stomach oil called mumiyo at potential threats like skuas. Because the petrels nest in the same place year after year, the mumiyo will harden and build up; in some places, scientists have excavated layers of vomit dating back more than 34,000 years!

Mascarene Petrel Pseudobulweria aterrima

It is known to breed in very small numbers in the Grand Bassin – Le Dimitile Important Bird Area in the mountains of Réunion. The species is classified as critically endangered as it is inferred from the number of records that there is an extremely small population threatened by introduced species, such as feral cats and house rats, and light pollution. Public awareness campaigns resulted in the finding of 58 Mascarene petrels between 1996 and 2021. Réunion scientists reported this as part of their work to locate breeding colonies using acoustic surveys.

Bird #51 - the Laysan albatross (NT)

If you're out on the open ocean in the North Pacific, you might see one of these soaring past, especially if you're near the Hawaiian Islands where almost all of them breed.

I don't think this needs any extra facts, since Anon already mentioned Wisdom (btw, she was last seen December 2023!), but it seems worth mentioning that they can moo like cows and whinny like horses. Not the sound I expected from them.