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My Little Maniraptor: Children of Day and Night by Albertonykus My Little Maniraptor: Children of Day and Night by Albertonykus
Celestia and Luna care for some of their non-maniraptor subjects, whose identities are reflective of different evolutionary histories.

Many of the ancestral characteristics of reptiles are adaptations for life in warm, dry environments, from their aglandular, scaly skin to their tendency to excrete waste as pasty uric acid instead of liquid. Mammals, on the other hand, probably spent most of their history under the cover of darkness, hence the loss of good color vision and a greater reliance on olfaction in most mammals. (Derived primates like us had to re-evolve good color vision, and even then most of us have fewer color receptors than many reptiles.)

Today, long after the K-Pg extinction allowed mammals to become the largest animals in most ecosystems, these trends still hold, as the majority of extant reptiles are diurnal while the majority of extant mammals are nocturnal (or at least remain active at night). This is even reflected in the original cartoon, in which Celestia's pet is a bird (though a mythical one) and Luna's (if the official comics are anything to go by) is a mammal.
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:iconmugenseiryuu:
MugenSeiRyuu Featured By Owner Jun 21, 2014
And then there are nocturnal Dinosaurs like the Owl. Although these still would call a plan to cause eternal night insane....
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:iconalbertonykus:
Albertonykus Featured By Owner Jun 21, 2014
Certainly there are exceptions on both counts. (We are diurnal mammals, after all.)
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:iconmugenseiryuu:
MugenSeiRyuu Featured By Owner Jun 22, 2014
Yes. But most would consider Eternal Night a bad idea.
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:iconalbertonykus:
Albertonykus Featured By Owner Jun 22, 2014
 Yes, agreement would be unanimous there (at least if they had a working understanding of ecology).
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:iconthearchosaurqueen:
TheArchosaurQueen Featured By Owner Jan 7, 2014  Hobbyist Digital Artist
Very nice idea to bring across in a fan/paleo artwork.
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