Which four families make up the order Procellariiformes?

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Black-browed albatross (Diomedea melanophris) — Procellariiform Black-browed albatross (*Diomedea melanophris*).

The order Procellariiformes, commonly known as tube-nosed seabirds, consists of four distinct families. These oceanic birds are characterized by their tubular nostrils, webbed feet, and the excretion of stomach oil.12

The four families are:

Diomedeidae: This family includes the albatrosses, which are known for their extremely long, narrow wings and large size.21
Procellariidae: This diverse group comprises shearwaters, fulmars, prions, and large petrels.21
Hydrobatidae: This family consists of storm petrels, which are small birds often observed walking on the water's surface.21
Pelecanoididae: This family includes the diving petrels, which are small, stocky birds adapted to cool subantarctic seas.21