Now, to not leave anything else unexplained, the humans in the land of Coatlán aren't humans, they're also Coatlaltecas! Not that it's something the public needs to know, but this explains why:
1) They don't have belly buttons.
2) They lay eggs.
3) I said there were no anthropomorphic mammals in the land of Coatlán.
4) I explain why there are VERY humanoid Coatlaltecas.
5) Why they can interbreed.
In essence, this is something no one "in the universe" knows or suspects. I would have liked to have published this strip just before Chawi's baby hatched, but the tight schedule didn't let me finish that on time. If I ever publish a compendium (Probably my next book project), I will fix that.
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