Expanding on Bill's suggestion. I have found that using two of the reflector lamps with the 13-15w compact fluorescent bulbs in them gives you plenty of light to photograph w/o the flash and will nearly rid you of shadow...though shadow can sometimes be good. The fluorsecents also give off much less heat than regular incandescent lightbulbs allowing for more safety for the animal and shoot time if the critter is behaving well.
Those pics look pretty good to me rapunzel. The hardest thing for me was trying to get a nice looking picture of my Cobalt Blue. I have several blurry photos, but the ones that are nice and clear came out pretty good overall. at least one of them you can see the nice blue irridescence on the legs with the aid of a blacklight. The thing with a burrower like that I guess is to get them at night when they're feeding. My Cobalt just stood there letting me take snapshots. She even turned to the other side to let me get a shot of her good side.