What do you do with a Chipmunk?

When we saw it yesterday afternoon, wobbling among the tall grass in the backyard, I thought it might just be a bit young, and not yet entirely steady on it's feet. But when I saw the chipmunk again today, it seemed a good deal less lively, which has caused me to worry. (It even let me get close enough to take a series of photos, which probably isn't a sign of good health for a chipmunk.)

A local wildlife rehabilitator we spoke to suspected internal injuries, perhaps even poison, and suggested we gently place it in a box with some food, and wait a few hours.

Later, when the chipmunk seemed a good deal more active, she suggested we ought to bring it to her, so she could, in turn, have it examined by a vet. She thought it might be young (which might explain why it was reasonably comfortable with being gently handled), perhaps even orphaned, and probably underfed (which might explain the unsteadiness). There's the possibility of illness, of course, but we remain hopeful.

We've promised to bring it home and release it in the backyard once it's healthy enough to get around on it's own. I hope that will be soon.