Ostrich egg

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.

Ostrich eggs in a nest on a farm

Biology

The female common ostrich lays her fertilized eggs in a single communal nest, a simple pit, 30 to 60 cm (12–24 in) deep and 3 m (9.8 ft) wide,[1] scraped in the ground by the male. The dominant female lays her eggs first, and when it is time to cover them for incubation she discards extra eggs from the weaker females, leaving about 20 in most cases.[2] A female common ostrich can distinguish her own eggs from the others in a communal nest.[3] Ostrich eggs are the largest of all eggs,[4] though they are actually the smallest eggs relative to the size of the adult bird — on average they are 15 cm (5.9 in) long, 13 cm (5.1 in) wide, and weigh 1.4 kilograms (3.1 lb), over 20 times the weight of a chicken's egg and only 1 to 4% the size of the female.[5] They are glossy cream-colored, with thick shells marked by small pits.[6]

The eggs are incubated by the females by day and by the males by night. This uses the coloration of the two sexes to escape detection of the nest, as the drab female blends in with the sand, while the black male is nearly undetectable in the night.[6] The incubation period is 35 to 45 days, which is rather short compared to other ratites. This is believed to be the case due to the high rate of predation.[5] Typically, the male defends the hatchlings and teaches them to feed, although males and females cooperate in rearing chicks. Fewer than 10% of nests survive the 9 week period of laying and incubation, and of the surviving chicks, only 15% of those survive to 1 year of age.[7]

A possible origin for the myth that ostriches bury their heads in sand to avoid danger lies with the fact that ostriches keep their eggs in holes in the sand instead of nests, and must rotate them using their beaks during incubation; digging the hole, placing the eggs, and rotating them might each be mistaken for an attempt to bury their heads in the sand.[8]

Human uses

In Thebes, Egypt, the tomb of Haremhab, dating to approximately 1420 BC, shows a depiction of a man carrying bowls of ostrich eggs and other large eggs, presumably those of the pelican, as offerings.[9]

Ostrich eggshells were used as containers in North Africa as early as the fourth millennium BC and in the Royal Cemetery at Ur from the third millennium. From the first millennium in the ancient Punic civilization, there are many examples of ostrich eggs decorated with painted geometric designs for use as cups and bowls. These have been found in Carthage, Sardinia, Sicily, the Iberian Peninsula and Ibiza. The tradition of using ostrich eggs as containers (sometimes decorated) continues to the present among the San people.[10]

In the Middle Ages, ostrich eggs from Ethiopia were exported through the port of Bāḍiʿ on the Red Sea.[11] During the Renaissance in Europe (15th–16th centuries AD), ostrich eggs were mounted in silver as goblets for display in cabinets of curiosities.[10] Decorated eggs continue to be widely displayed in Eastern Orthodox churches, although their symbolism is disputed. They may symbolize the Virgin Birth, since according to Job 39:13–17 the ostrich lays its eggs in the sand and forgets, so they are hatched by the sun alone. This significance may lie behind the egg suspended above the Virgin Mary in Piero della Francesca Brera Madonna painting.[12]

In 2020, studies of decorated ostrich eggs in the British Museum showed that the methods by which they had been sourced, produced and traded were more complicated than had previously been imagined.[13] Isotope analysis showed that eggs from the same archaeological site had originated in different places. The studies suggested that, rather than the eggs having been laid by captive birds, almost all had most likely been collected in the wild; a potentially hazardous undertaking.[14]

Today, ostrich eggs are a special luxury food.[15]

References
Wikimedia Commons has media related to Struthio camelus eggs.
  1. Harrison, C.; Greensmith, A. (1993). Bunting, E. (ed.). Birds of the World. New York, NY: Dorling Kindersley. p. 39. ISBN 978-1-56458-295-9.
  2. Davies, S.J.J.F. (2003). "Birds I Tinamous and Ratites to Hoatzins". In Hutchins, Michael (ed.). Grzimek's Animal Life Encyclopedia. Vol. 8 (2nd ed.). Farmington Hills, MI: Gale Group. pp. 99–101. ISBN 978-0-7876-5784-0.
  3. Bertram, B.C.R. (1979). "Ostriches recognise their own eggs and discard others". Nature. 279 (5710): 233–234. Bibcode:1979Natur.279..233B. doi:10.1038/279233a0. PMID 440431. S2CID 4236729.
  4. Hyde, Kenneth (2004). Zoology: An Inside View of Animals (3rd ed.). Dubuque, IA: Kendall Hunt Publishing. p. 475. ISBN 978-0-7575-0170-8.
  5. Perrins, Christopher (1987) [1979]. Harrison, C.J.O. (ed.). Birds: Their Lifes, Their Ways, Their World. Reader's Digest Association, Inc. pp. 168–170. ISBN 978-0-89577-065-3.
  6. Nell, Leon (2003). The Garden Route and Little Karoo. Cape Town: Struik Publishers. p. 164. ISBN 978-1-86872-856-5.
  7. Davies, S. J. J. F.; Bertram, B. C. R. (2003). "Ostrich". In Perrins, Christopher (ed.). Firefly Encyclopedia of Birds. Buffalo, NY: Firefly Books, Ltd. pp. 34–37. ISBN 978-1-55297-777-4.
  8. "Do ostriches really bury their heads in the sand?". Science World British Columbia. 11 December 2015. Retrieved 2 January 2017.
  9. Brothwell, Don R.; Patricia Brothwell (1997). Food in Antiquity: A Survey of the Diet of Early Peoples. Johns Hopkins University Press. pp. 54–55. ISBN 978-0-8018-5740-9.
  10. Gordon Campbell, ed. (2006), "Ostrich eggs", The Grove Encyclopedia of Decorative Arts, Oxford University Press.
  11. Yusuf Fadl Hasan (1967), The Arabs and the Sudan: From the Seventh to the Early Sixteenth Century (Edinburgh University Press), pp. 64–66.
  12. Tom Devonshire Jones; Linda Murray; Peter Murray, eds. (2013), "Ostrich eggs", The Oxford Dictionary of Christian Art and Architecture (2nd ed.), Oxford University Press.
  13. Hodos, Tamar (2020). "The origins of decorated ostrich eggs in the ancient Mediterranean and Middle East". Antiquity. 94 (374): 381–400. doi:10.15184/aqy.2020.14. S2CID 216354574.
  14. Addley, Esther (9 April 2020). "British Museum looks to crack mystery over decorated ostrich eggs". The Guardian. Retrieved 10 April 2020.
  15. Roux, Michel; Martin Brigdale (2006). Eggs. Wiley. p. 8. ISBN 978-0-471-76913-2.
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