For small birds the 60-250 is a bit short, as is any 200mm lens. For larger wild life it can be just fine. But, 6 feet away, it's the equivalent of an external focus 135mm lens. That being said, I have images taken of everything from the tiniest birds to moose, wolves and bears. You just have to work a bit harder.
Tiny bird. (Boreal Chickadee)
Small animal. (Pine Martin)
Medium Sized animal (Red Wolf)
Bigger Animals (Black Bear)
Really Big animals (Moose)
Really big birds (Either an Otter or a Beaver bush plane, I think it's an Otter, the Beaver has a stubbier nose.)
Personally for wildlife I'd be looking at a Sigma 150-500 if I could find it, but the 60-250 with the 1.4 TC will be just fine if you already own it. It makes up for it's shorter length with great IQ. I also often carry the A-400 which with the 1.4 TC gives me 560 ƒ8, but a lot of times I don't even get it out, the 60-250 is enough, and sharper.
Some more pictures here.
Slideshow.
http://s1132.photobucket.com/user/Norm_Head/slideshow/Pentax_forum/Sample_by...name/DA-60-250
Sometimes the slide show cuts out after 50 images. The whole album is
here.