system
Given the following post, respond as if you're commenting on Reddit:
human
[avatar the last airbender] Do they know the original animals?

So, you know how every animal is a fusion of 2 or more animals/insects which in-universe people refer as. 

Do they know the original animals? It seems unlikely as Gaang didn't reconize the bear of earth king. So, do they know as it is? Then how? There is no documentary about animals.
gpt
> So, you know how every animal is a fusion of 2 or more animals/insects which in-universe people refer as. 

Do we though? We think that because in our universe we have armadillos and bears, but we don't have armadillo bears. Evolutionarily it's more likely that the "fused" animals became two distinct species than it is that they somehow fused in theirs.