Some people, including myself, care more about internal consistency than about similarity to RL. It isn't so bad when weapons change and suddenly you (perhaps) seem to recall your bow looking a bit different, but it couldn't have, could it?...But some characters are going to grow a sudden desire to do something that they've never heard of. If one of my characters experienced that, they would conclude that they must have gone insane, pulling ideas out of 'nowhere' (OOC land) like that.
kinvoya>
There are reasons that explanation doesn't cut it...
Aside from the view that if it's there, you can see it:
If animals were ever 'young' and invisible, there would be a lag between population and growth rate. So if you killed all of an animal, some of them might mature in the next hour or so and appear out of nowhere. It's a bit hard to tell with the new invisible animal movement, but I will make the unsubstantiated claim that cantr isn't coded that way.
kinvoya wrote:Assuming that the people of Cantr can see the animals reproduce then they might wonder if little Cantr people could be produced that way also. If one did suddenly appear via birth it might be a bit of a surprise but I don’t think it would be such a big mystery.
If it isn't in any of the game screens, characters can't see it. (The inverse need not be true.). So characters cannot possibly see animals reproducing.
Also, what do cantr people and animals have in common? The only thing I can think of is the ability to be hurt and killed by attacks. That isn't a lot to make such a big extrapolation from...especially one that you've seen for 10+ years to be false.

