Procellariiformes
Diocedeidae Hydrobatidae Pelecanoididae Wikispecies has information on: Procellariiformes Procellariiformes is an order of seabirds of pelagic habitats, that is, they inhabit the open ocean. The procelariforms are characterized by having the nostrils included in tubes located in the beak, which is usually long and curved at the tip. This adaptation allows them to expel from the body the salt acquired by ingestion of sea water. The procelariformes have long and narrow wings, which gives them an aerodynamic shape and minimizes the energy spent during their long flights. Its plumage is usually white, and may have shades of gray or black. The procelariformes have the toes joined by interdigital membranes, the posterior finger being absent or poorly developed. These birds feed on the high seas of cephalopods and small fish. There are 134 species of procelariformes worldwide, divided into four families: ▪ Procellariidae: 86 species ▪ Diomedeidae: 21 species ▪ Hydrobatidae: 23 species ▪ Pelecanoididae: 4 species ...