How do I take care of an injured chipmunk?
Call animal control and get in touch with a licensed wildlife rehabilitator. Legally you can’t keep it or try and care for it – only licensed individuals are allowed to care for and rehabilitate wildlife. Chipmunks often carry diseases communicable to humans – including bubonic plaugue – so you should not handle it but turn it over to the pros.
The best thing for the animal would be to give it a peaceful death. But if you are adamant about keeping it, you must, MUST, take it to a vet for shots. And for some stupid reason, it is illegal to keep them, you need a license. For food, give it seeds from local plants and trees. To take care of it, as I said, license, gloves, you need to get it vaccinated and cleared of disease. Best of luck!