Sacred mud-probers that are not one tidy family tree
Ibises are long-legged waders of Threskiornithidae with downcurved bills, usually probing wet mud in groups for crustaceans. They nest territorially, often in trees beside spoonbills or herons. Living forms all fly—yet Hawaiian Apteribis and Jamaican Xenicibis were flightless, the latter with club-like wings.
The birds called ibis are not monophyletic: spoonbills (Platalea) nest inside the same family tree. Roughly twenty-nine extant ibis species plus six spoonbills share two major clades—one Old-and-New-World assemblage including Threskiornis, and a smaller New World group. Most forage freshwater wetlands; white-faced and black-headed ibises also use flooded fields. Venezuela’s Llanos host seven sympatric species that partition habitat and prey. In Indian farmland, black-headed and glossy ibises favour shallow wetlands year-round while endemic red-naped ibises use uplands, dodging direct competition.
Ancient Egypt tied the African sacred ibis to Thoth, god of writing and measurement; Late Period art shows an ibis-headed scribe. Hermopolis raised birds for sacrifice, and Saqqara’s Ibis Galleries held about one and a half million mummies. Mitogenomic work on those mummies suggests wild capture rather than farming. Australian white ibises now thrive in cities—nicknamed bin chickens—and placed second in a 2017 Guardian Australia Bird of the Year poll. University of Miami’s mascot Sebastian celebrates legendary hurricane bravery: last to shelter, first to return.
Breeding colonies can pack wetlands or agricultural trees; Australian white and red-naped ibises even nest inside cities. Living genera appear ancient—most seem to have diversified before about fifteen million years ago, with Middle Miocene Geronticus perplexus known from a humerus scrap at Sansan, France. The Réunion ibis vanished in historical time. From temple galleries to tip-yard memes, the curved bill keeps starring wherever mud and meaning meet.
Source: Ibis
