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| Casuariiformes | |
|---|---|
| Name | Casuariiformes |
| Fossil range | Neogene–Recent |
| Taxon | Casuariiformes |
| Authority | Illiger, 1811 |
| Subdivision ranks | Families |
| Subdivision | Casuariidae (cassowaries), Dromaiidae (emus) |
Casuariiformes are an order of large, flightless birds native to Oceania and nearby islands, comprising two extant families recognized in modern avian systematics. These birds are notable for their size, cursorial adaptations, and ecological roles in rainforest and savanna ecosystems; they feature prominently in natural history accounts from Linnaeus through contemporary work by institutions such as the Natural History Museum, London and the Australian Museum.
Taxonomic treatment of Casuariiformes has been shaped by comparative anatomy studies by figures like Georges Cuvier and molecular phylogenetics from laboratories at University of Queensland, CSIRO, and the Smithsonian Institution. Early classification placed these birds with other paleognathes including Struthioniformes, Rheiformes, and Tinamiformes; 20th‑ and 21st‑century DNA analyses by teams at Monash University, Harvard University, and the Australian National University refined relationships and split cassowaries (family Casuariidae) from emus (family Dromaiidae). Fossil evidence from sites in Australia, New Guinea, and the South Pacific—including genera described by paleontologists at the University of New South Wales and the Queensland Museum—documents Neogene diversity and extinct forms that coexisted with megafauna discussed in research by the Australian Mammal Society.
Members of this order show convergent characteristics with other ratites studied in comparative anatomy by researchers at the Royal Society and the Linnean Society of London. Morphological traits include reduced pectoral girdles, robust hindlimbs, and tridactyl feet adapted for running; osteological work in museums such as the Natural History Museum, Vienna and the American Museum of Natural History details femoral and tarsometatarsal adaptations. Cassowaries display casque structures on the cranium that have been the subject of biomechanical and display research at Monash University and The University of Melbourne, while emus exhibit distinctive feather microstructure investigated by teams at Harvard Museum of Comparative Zoology and the University of Oxford. Musculature and respiratory adaptations have been compared with ratite research from the Smithsonian Institution and the Max Planck Institute for Ornithology.
Extant populations occur predominantly in Australia and New Guinea, with range records logged by agencies such as the Australian Government Department of Agriculture, Water and the Environment and the Papua New Guinea Department of Environment and Conservation. Cassowary species inhabit tropical rainforest and coastal lowland forests studied in fieldwork collaborations with Conservation International and the World Wildlife Fund, whereas emus occupy open savanna and semi‑arid zones monitored by the Australian Bureau of Meteorology and regional land councils including NSW National Parks and Wildlife Service. Historical range shifts documented in faunal surveys by the Royal Australasian Ornithologists Union and paleobiogeographic syntheses by the Geological Society of Australia reflect Pleistocene climatic changes tied to sea‑level fluctuations recorded by the Intergovernmental Panel on Climate Change.
Behavioral ecology studies conducted by universities such as The University of Western Australia and institutions like the Zoological Society of London emphasize foraging, seed dispersal, and interspecific interactions. Cassowaries are key seed dispersers for plant genera cataloged in botanical work at the Royal Botanic Gardens, Kew and the National Herbarium of New South Wales, while emus influence grassland composition described in ecological reports from the Australian Academy of Science. Social systems vary: some cassowary populations exhibit solitary territoriality reviewed in papers published through the Journal of Avian Biology and collaborative projects with the Australian Wildlife Conservancy, whereas emus form nomadic flocks during resource pulses, documented by the CSIRO and regional rangeland managers. Predator–prey dynamics involve interactions with introduced mammals addressed by the Invasive Species Council and indigenous hunting practices recorded by researchers at the Australian Institute of Aboriginal and Torres Strait Islander Studies.
Reproductive strategies have been elaborated by ornithologists affiliated with the University of Tasmania and breeding programs at the Taronga Zoo and the San Diego Zoo. Cassowaries exhibit male brooding and polygynandrous mating systems described in ethological work published by the Royal Society Publishing, with clutch characteristics and incubation periods monitored by field projects supported by the Australian Research Council. Emu reproductive biology, including male incubation and chick development, is detailed in studies from the University of Adelaide and agricultural research at the Department of Primary Industries, Victoria. Lifespan and juvenile survival rates have been tracked in long‑term population studies coordinated by organizations such as the BirdLife Australia and the IUCN Species Survival Commission.
Conservation assessments by the International Union for Conservation of Nature and recovery plans prepared by the Australian Government identify habitat loss, vehicle strikes, and invasive species as principal threats documented in reports by the World Wide Fund for Nature and regional conservation NGOs like the Bush Heritage Australia. Cassowary species have IUCN listings influenced by deforestation in Papua New Guinea and Australia with mitigation measures proposed by the United Nations Environment Programme and local land councils. Emu populations are broadly secure but face localized pressures cataloged by state agencies such as Parks Victoria and agricultural stakeholders represented in consultations with the Australian Conservation Foundation. Ex situ conservation efforts involve zoos and research institutes including the San Diego Zoo Global and the Royal Zoological Society of Scotland, while community‑led programs partner with indigenous organizations like the National Native Title Tribunal to integrate traditional knowledge into stewardship.
Category:Bird orders