Aang is the author of this book and I love that wild creatures are divided into Aang's self made categories of "ones you can ride" and "ones you can't ride". There are notes from characters in LOK correcting Aang's notes. Bolin is very offended by Aang's entry on fire ferrets and it is sending me.

And I know you are all wondering what does the official lore say about Eel hounds... Not much to the contrary of what I have speculated. But I did find this tid bit: Suki is afraid of them. Most Kiyoshi islanders are as they are mostly wild. Aang also says you can't ride them in the city at rush hour because you will get a ticket... So guess future EOC Aang and Kiyoi have an adventure with Pebo Which results in the Fire Lady getting a speeding fine 😂😂😂