Have you tried dipping his beak into the water? I know that when you order chicks from a hatchery they recommend doing this. Maybe it will work. Good luck.

Goodness! I guess all these strong feelings about your ducklings means that you all care for them a great deal. That's a good thing! :) I'm always learning something new here and I love all the input. I have played the "mama" part with my first and only 2 babies. My mallard is about a month old and his playmate is a little over a week old now, and is a Blue Swedish. I've offered them chick starter and they seem okay with that. They also have some greens everyday. I've also offered them tepid water in a shallow pan, but I didn't know about them needing to get their entire heads into the water. I will remember that from now on. I've been letting them play in about 2 inches of warmish water in the bathtub with food in the bottom. I did already know about them needing to be warmed up quickly after getting wet. They seem cold when they're through playing in the water. I remove them and wrap them in a warm towel. Then I lay down on the floor beside them and let them get under my shirt. I breath warm air on them and rub them lightly with the towel while they preen and fall asleep. I have never put them back in their pen while they are wet, though. I know they'd get mighty sick mighty quick. While they are so young I keep a couple of fleece throws for them to cuddle up in while they are penned and in their box. The pen and box have been moved to the garage now and I use a heat lamp for them. My mother raised chickens, so I knew a little bit about birds and used some of what she taught me to help me with these little ducklings. No breeze or wind is a very important point. Thanks for teaching me about the depth of water so they can clean their bills, nostrils and eyes. Aren't they just the cutest little creatures you've ever seen? I just love ducks! I'm so glad one of them found me. :) Maggie chickenmama1

I'm no duck expert...but I'll give this a try. Since there was an injury to it's head, do you think it's possible that ducky may have had a brain injury as well? A car is a big force against a little duckling, even if it wasn't hit. Might it be in shock from the traumatic event? I'm sure you would have checked the legs for possible problems by now, so there's not much I can think of asking about something wrong with the legs. Any chance you can post a few images so we can see how ducky is doing?

Try to contact a wildlife rehabilitator for advice. The duck is probably best off not staying with you. Unfortuately the link on this site's FAQ link no longer works. If you have trouble finding a rehabilitator, let people know your location and maybe someone can help.