It kinds depends on how old they are - any way you can post a picture?
It's possible that their mother is out roaming around, and considers that spot behind your garage a safe place to leave them.
Assuming they're younger, Just leave them be, and check them out at the end of the day. You might not actually see the mother, but if the kittens aren't covered in head to toe in their own feces, you know that they have a mother coming by to clean them up.
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I had a mother once get hit by a car 2 days after she bore a litter of kittens - lil' guys haven't even opened their eyes yet... the next 4-or-so weeks were filled with me cutting class to come home from school and feed/bathe them in the afternoon, and then doing the same again after dinner every night.... they're each like a little shit machine, and they don't learn to clean it up until they're a bit older.
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If they're covered in crap, and you're leaving, I'd do as suggested, and call the animal control peeps - giving them instructions/access as to where they are, and letting them know you're not going to be around that day.
If they're between 4 and 6 weeks, it's possible that they've learned to clean themselves, but still need help feeding... in that case, animal control will need to know because kittens need to be fed a mother's milk supplement by hand... though a can or two of soft food nearby might allow for them to survive... but the problem with leaving them soft food is it might also attract unwanted predators.
Without seeing the kittens myself, it's hard to tell you what needs to be done... but I hope you find this information helpful.
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-D.
ICQ: 202-96-31
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