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Rheas are large, flightless birds with grey-brown plumage, long legs, and long necks, similar to an ostrich. Large males of R. americana can reach 170 cm (67 in) tall at the head, 100 cm (39 in) at the back [13] and can weigh up to 40 kg (88 lb). [14] The lesser rhea is smaller, with a height of 100 cm (39 in). [13]
Emus are the fourth or fifth heaviest living bird after the two species of ostrich and two larger species of cassowary, weighing slightly more on average than an emperor penguin. Adult emus weigh between 18 and 60 kg (40 and 132 lb), with an average of 31.5 and 37 kg (69 and 82 lb) in males and females, respectively. [ 33 ]
Struthionidae (/ ˌ s t r uː θ i ˈ ɒ n ə d iː /; from Latin strūthiō 'ostrich' and Ancient Greek εἶδος (eîdos) 'appearance, resemblance') is a family of flightless birds, containing the extant ostriches and their extinct relatives.
A Wiltshire animal sanctuary has shared pictures of emu poo and feathers in an attempt to find a missing emu it fears may have been “swept downstream” in a river. ... emus are the second ...
The Somali ostrich occurs in the Horn of Africa, having evolved isolated from the common ostrich by the geographic barrier of the East African Rift. In some areas, the common ostrich's Masai subspecies occurs alongside the Somali ostrich, but they are kept from interbreeding by behavioral and ecological differences. [15]
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A 2008 study of nuclear genes shows ostriches branching first, followed by rheas and tinamous, then kiwi splitting from emus and cassowaries. [23] In more recent studies, moas and tinamous were shown to be sister groups , [ 6 ] [ 8 ] [ 10 ] and elephant birds were shown to be most closely related to the New Zealand kiwi. [ 9 ]
Struthioniformes is an order of birds with only a single extant family, Struthionidae, containing the ostriches.Several other extinct families are known, spanning across the Northern Hemisphere, from the Early Eocene to the early Pliocene, including a variety of flightless forms like the Paleotidae, Geranoididae, Eogruidae and Ergilornithidae, the latter two thought to be closely related to ...