http://indomita.net/ Is a new WILD horse sim game. It is in beta, and is still only allowing members join in small waves. (So you may have to wait a week or so until it opens again >.<) This game is, well I really like it XD. It is the most playable beta I've seen and the admin is EPIC and adds new stuff like twice a week XD You play as a horse, and the art is great.
RANDOM SCREENSHOT <3(You start off with 5 horse slots) You train the horses in certain roles. The current options are: Warrior, leader, caretaker, explorer and diplomat. Every herd should have them all XD There is trading and such, and the site does not really have any currency (save for the pay-for-with-real-life-money stuff, but it's very easily obtainable with hard work.) So the site economy is like 89% trade based. THIS IS NOT A BREEDING SIM! Yeah you can breed, and do it smartly for better foals...but there is no way-no reason for people to breed all the time. OH! It's also a great rp site! <3 but you don't have to rp to play.
http://wolfsoul-sim.tumblr.com/ Wolf soul is a sim game that will proably not be open to new player for some time. It's in beta as well, but I have to say that's it's not really playable yet XD I honestly don't think it will be playable for a while...like 6 months? But if you like wolves it's 100% worth tracking XD