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The first verified occurrence of genetically identical avian twins was demonstrated in the emu. [63] The egg surface is granulated and pale green. During the incubation period, the egg turns dark green, although if the egg never hatches, it will turn white from the bleaching effect of the sun. [64]
Kalti paarti carving (also known as emu egg carving) is an art form made by carving a kalthi-parti, or emu egg. The practice began in the mid to late nineteenth century and while it has been practiced by people in Australia from many backgrounds, it is often strongly associated with Aboriginal art.
Egg decoration is particularly popular in Eastern European countries. Some eggs, like emu or ostrich eggs, are so large and strong that the shells may be carved without breaking. Decorations on emu eggs take advantage of the contrast in colours between the dark green mottled outside of the shell and the shell-underlay.
The eggs measure about 9 by 14 cm (3.5 by 5.5 in) – only ostrich and emu eggs are larger. The male incubates those eggs for 50–52 days, removing or adding litter to regulate the temperature, then protects the chicks, which stay in the nest for about 9 months. He defends them fiercely against all potential predators, including humans.
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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]
Pheasant eggs and emu eggs are edible, but less widely available; [11] sometimes they are obtainable from farmers, poulterers, or luxury grocery stores. In many countries, wild bird eggs are protected by laws which prohibit the collecting or selling of them, or permit collection only during specific periods of the year. [11]
The northern cassowary and the emu share homologous features. For example, both have a blue patch of colour on their face/neck, but the functions of these differ. The emu's patch is of a paler colour and is used as a form of camouflage where it is located. The northern cassowary's patch of blue is brighter, and is used for attracting mates.