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The scientific name Dromornithidae derives from the Greek words δρομαίος, dromaios ("swift-running") and ὀρνις, ornis ("bird"). [8] The family was named by Max Fürbringer in 1888, citing W. B. Clarke and Gerard Krefft, Owen's separation from "Dromaeus" and Dinornis, and a note by von Haast allying Dromornis with Dromaeus.
A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. [1] Thundereggs are rough spheres , most about the size of a baseball —though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across.
The egg shells were dated to between 53.9 and 43.4 thousand years BP, suggesting that humans were collecting and cooking Genyornis eggs in the thousands of years before their extinction. A later study suggested that the eggs actually belonged to the giant malleefowl, a species of extinct megapode. [11] [12]
The study’s lead author, Oscar Sanisidro, expects that as these “thunder beasts” grew in size, they faced less competition for food, as the Earth was still full of smaller mammal species at ...
Dromornis planei was a very large flightless bird, similar in height to an ostrich or emu but with a heavier build; the species is however exceeded in size by the largest of these "thunder birds" Dromornis stirtoni. [11] Its bill was curved and deep, the overall size of the head and skull was remarkably large. [10]
A photo shows the brown spiders, including a female with a robust egg sac. The new species carries fewer but larger eggs than other, similar species, researchers said.
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Its egg, live or subfossilised, was known as early as 1420, when sailors to the Cape of Good Hope found eggs of the roc, according to a caption in the 1456 Fra Mauro map of the world, which says that the roc "carries away an elephant or any other great animal".