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ɪ f ɔːr m iː z / is an order of large flightless birds that has four surviving members: the three species of cassowary, and the only remaining species of emu. They are divided into either a single family, Casuariidae, or more typically two, with the emu splitting off into its own family, Dromaiidae.
The emu (/ ˈ iː m juː /; Dromaius novaehollandiae) is a species of flightless bird endemic to Australia, where it is the tallest native bird. It is the only extant member of the genus Dromaius and the third-tallest living bird after its African ratite relatives, the common ostrich and Somali ostrich. The emu's native ranges cover most of the ...
Several species of birds are also cursorial, mainly those that have attained larger body sizes (ostrich, greater rhea, emu). Most of the stride length in birds comes from movements below the knee joint, because the femur is situated horizontally and the knee joint sits more towards the front of the body, placing the feet below the center of ...
The common ostrich is the largest and heaviest living bird. Males stand 2.1 to 2.75 m (6 ft 11 in to 9 ft 0 in) tall and weigh 100 to 130 kg (220 to 290 lb), whereas females are about 1.75 to 1.9 m (5 ft 9 in to 6 ft 3 in) tall and weigh 90 to 120 kg (200 to 260 lb). [20]
The work above is just one example of an ecomorphology based behavioural study. Studies of this variety are becoming increasingly important in the field. Behavioural studies interrelate functional and eco-morphology. Features such as locomotory ability in foraging birds have been shown to affect dietary preferences by studies of this type. [11]
Eggs of: ostrich, emu, kiwi and chicken. Egg size tends to be proportional to the size of the adult bird, [citation needed] from the half gram egg of the bee hummingbird to the 1.5 kg egg of the ostrich. Kiwis have disproportionately large eggs, up to 20% of the female's body weight. [18]
Skeletal mount (note damaged skull) Presently, most authorities consider the southern cassowary monotypic, but several subspecies have been described. [3] It has proven very difficult to confirm the validity of these due to individual variations, age-related variations, the relatively few available specimens (and the bright skin of the head and neck – the basis upon which several subspecies ...
Several hypotheses have been proposed to explain helping behaviour in cooperatively breeding bird species. Classic ideas of ecological or demographic constraints on offspring dispersal and breeding appear to be limited in their application to the chestnut-crowned babbler, [ 15 ] nor is there any evidence to suggest that signal-based factors are ...