In order to prevent itself from degenerating into anarchy or a childhood game of Cowboys and Indians (I buy runescape gold shot you! No you didn't! Yes I did! No you didn't!) there are two rules which nearly every freeform game I have ever seen follows, and while the names of these rules change slightly from place to place, the following are the most clear and consistent that I have found.
And finally, regarding 8BitOnwards thoughts on Assassin's Creed, my suggestion to Ubisoft would be to look at Io Interactive's old school Hitman series as how to tackle an objective with the use of multiple methods. As you say, it wasn't perfect but it didn't deserve to be as completely ignored as it was including by Activision's marketing team.
We generally discourage letters on multiple different subjects, but since they're all good points, and you're a Squirrel Girl fan, we'll let it slide. (Tippy Toe 4 lyfe!) they obviously have some kind of lung analogue since they can speak and breathe, so in a certain sense that necessitates a kind of circulatory system, though as said above, a vastly different one
The best place in my opinion to hunt Red Chinchompa's is slightly north of the Tear Drop pond. If you look on your map, you will see two ponds, one is a U shaped pond and the other one is shaped somewhat like a teardrop. This is a common place however, and people are often there meaning there could be some competition.
It sort of implied that they don have blood (and a jmod once said that but there was no real confirmation), so depending on how you interpret that, their circulatory system may be completely different to a human or not exist at all. ymmv on this one as per your headcanon a respiratory system, though given the strangeness of their circulatory system it almost guaranteed to work waaaay differently to ours.