CH, you've raised the other side if the deal too; the 'take as long as you can to make it most probable' side of the equation. And that gets into having some understanding of what to expect. Knowing that you can likely get close as long as you stay out of view, or knowing that you can be visible as long as your movements resemble something else (not human) if you're making the correct sounds, or whatever, can all be important. So can knowing how 'concerned' animals move. It's difficult to see someone watch a certain species move away, knowing that they will often/usually stop momentarily long enough to present a shot opportunity, often brief, periodically (like fox often do). But you can't just stand and watch and expect to make a shot when they do.
Caribou can be funny animals and often easy targets, if you know and are ready. If they are spooked, they'll run without stopping as if their tails are in fire. However, it they are concerned or alarmed, they'll often trot or walk away, but stop and look back. When they do, it is common for them to turn broadside. Depending on what the leader determines, they may move quickly again, so one has to be ready to make the most of the opportunity if it comes. It's kind of a "take your time, but be quick about it" deal.
