When you kill people, you can take over the Horses and Wagons and then sell them. In addition, any horse that you get can be taken to your stable, where you can pawn it or upgrade it. If you are selling the horse, the type of your horse will also play a part in the deal. You...
It's actually quite easy to find most of the exotic birds when you know where to look. You also don't require perfect pelts, so you can just use dead eye and let rip with a repeater to kill as many as you can when you find a bunch. The problem is just how many you need. And...