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The large size of elephant bird eggs means that they would have required substantial amounts of calcium, which is usually taken from a reservoir in the medullary bone in the femurs of female birds. Possible remnants of this tissue have been described from the femurs of A. maximus. [13] Aepyornis eggs, Muséum national d'Histoire naturelle, Paris
Egg cases are made of collagen protein strands, [4] and are often described as feeling rough and leathery. [5] Some egg cases have a fibrous material covering the outside of the egg case, thought to aid in attachment to substrate. [1] [6] Egg cases without a fibrous outer layer can be striated, bumpy, or smooth and glossy.
The grey-faced sengi is a species of the elephant shrew or sengi family, belonging to the genus Rhynchocyon.Its discovery was announced in 2008. [3] Until this species was discovered, only 15 species of elephant shrew were known, with the last living species having been described more than a century ago (the eastern rock elephant shrew, Elephantulus myurus).
Ostrich eggs in a nest on a farm. The egg of the ostrich (genus Struthio) is the largest of any living bird (being exceeded in size by those of the extinct elephant bird genus Aepyornis). The shell has a long history of use by humans as a container and for decorative artwork, including beads. The eggs are not commonly eaten.
The tops of elephant bird skulls display punctuated marks, which may have been attachment sites for fleshy structures or head feathers. [18] Mullerornis is the smallest of the elephant birds, with a body mass of around 80 kilograms (180 lb), [16] with its skeleton much less robustly built than Aepyornis. [19]
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At 1.5 kg (3.3 lb) and up to 17.8 cm × 14 cm (7.0 in × 5.5 in), the ostrich egg is the largest egg of any living bird, [2]: 130 though the extinct elephant bird and some non-avian dinosaurs laid larger eggs.
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