Hi teylix,
Some pretty good advice here. I end up shooting squirrels for practice when there aren't birds around because the little devils are challenging. I usually like to shoot longer than 300mm because I can stay outside their safety radius and still get pretty good close ups. Even though the squirrels around here are pretty used to people, it's still hard to really get close.
I also find handholding is more effective than using either a tripod or monopod because I generally need a bit more freedom in camera positioning than most support will give me -- like getting low even though my aging knees protest vigorously. Of course, for really big glass, there is no other way to go, but up to 510mm, with an FA* 300 f4.5 and Pentax F 1.7x Auto Focusing Adapter, I'm good handheld. Different people have different capabilities, but with the higher ISO capabilities of the K-5 and K-5 IIs (and your new K30), it's easier to get higher shutter speeds, even with slow max aperture combinations like I use. I've found with SR, I'm pretty confident on getting a good percentage of usable images handheld at 1/125 or faster with the 510mm kit.
Here are two examples -- the first is a melanistic black-gray squirrel. I've been trying without any success to get a good shot of one of these guys for over 6 years. Got this one first day out with the K-5 IIs right after I set it up as I like -- who woulda guessed. . .
K-5 IIs, FA* 300 f4.5 + F 1.7x AFA, f8 (lens wide open), 1/250, ISO 4500. PP'd with very light applications of Topaz Denoise, Topaz InFocus, resized for posting. No cropping, handheld, shot in jpeg ***.
A plain gray snacking from the same day.
K-5 IIs, FA* 300 f4.5 + F 1.7x AFA, f8 (lens wide open), 1/250, ISO 6400, PP'd with very light applications of Topaz Denoise, Topaz InFocus, resized for posting. No cropping, handheld, shot in jpeg ***.
Congrats on your K30! and good luck in your squirreling!
Scott