It's also noted that NPC creatures can attack each other, commonly known as 'hunting' / 'predation'. There was another thread discussing possibilities if extinction for useless NPC creatures, but I think people concluded any 'evolution' was down to levelling when you upgrade your own creature, rather than externals. Which is odd, in a way, In the Tribal and Civ phases, if you don't evolve (societally), the rival tribes and cities will leave you behind.
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