Fiamma eggs are not actually classified as eggs due to their peculiar structure. They contain no shell, and seem to lack the nutrition that most eggs do. Almost all of the energy that the "egg" is born with is dedicated to keeping the growing creature at extremely hot temperatures. The creature will die if its temperature drops anywhere below 1482.3 degrees Celsius. For this reason, it is not recommended that newborn Fiamas be kept in captivity anywhere outside the Science and Research Center, as protective equipment is first priority when handling such creatures.
The Science and Research Center has not yet been able to determine if the Fiamma is tangible when it reaches childhood. Its temperature becomes so high that there are no known materials that can get past the red flames without almost immediately reaching boiling point and vaporizing. It is believed that once a Fiamma reaches childhood, it becomes a spirit and thus cannot be touched outside of temperature changes. Researchers at the SARC believe this information to be false, although they've been unable to come up with any other explanation as to why the Fiamma is able to produce so much heat out of what seems to be nothing. Fiamma do not eat, so their energy seemingly comes from nowhere.
Some Arkians believe that Fiamma are fragments of the sun.