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Computed tomography scans also show that these eggs contain multiple eggshell fragments, some of which are very large.
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"The eggshell fragments we found appeared abnormally thin," Mr. Burnett said.
A few other finds, mostly of eggshell fragments from a number of sites, established oviparity as the only known mode of reproduction.
Some 350 ostrich eggshell fragments engraved with geometric patterns and dated to between 55,000 and 65,000 years ago were retrieved from South Africa's Diepkloof Rock Shelter.
A tiny room features a painting of Corduroy the Bear on the wall as well as a sad little checkerboard with bottle caps and eggshell fragments filling in as substitute pieces.
The team also found a few eggshell fragments that appeared to have been pierced with a tool to make a hole in the top part of the egg.
Gifford Miller, a geologist at the University of Boulder, Colorado, was trying to establish the date of Australian eggshell fragments belonging to G. newtoni and Dromaius novaehollandiae, an emu that survived the mass extinction.
Successfully hatched eggs (Figure 2) were identified by the presence of a distinct egg cap and an intact egg membrane (initial cracking, or pipping, of the egg typically results in two eggshell fragments, with the smaller fragment called the cap); such features are not typical of depredated eggs (Figure 3; Sargeant et al. 1998).
Artwork such as pendants and beads from ostrich eggshell fragments have been found at several places.
We know that ancient Egyptians were making a "tooth powder" as far back as 5000 BC (this would be the first toothpaste!) This "tooth powder" consisted of ash from ox hooves, myrrh, eggshell fragments and pumice.
Moderate to abundant eggshell debris and occasionally large eggshell fragments (>6 cm) were often present in the mudstones that surrounded individual eggs and egg clusters.
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