I've had my 5 little ducklings since Friday when I received them at the P.O. My tiny tiny Khaki Campbell(smaller than the rest), named Petal, has been limping on her back right leg since yesterday. I have no idea what could have happened to her, she lives in her brooder in my bedroom with 4 other little ones. They do not bully her at all, but I noticed she suddenly started limping when I went in to check her at midday yesterday. The leg works, but she sometimes holds it up just slightly off the ground, and doesn't want to put a lot of weight on it. When she stands still, she tends to hold it out to the side a little, presumably to avoid standing on it. The leg doesn't otherwise look abnormal, but it seemed to feel warmer than the other leg when I was examining her today. I was able to gently move it and the foot up and down, and nothing feels broken. It didn't seem to cause her excrutiating pa in or anything, she fussed a little when I moved it, but nothing extreme. When she lays down(fairly frequently) she sometimes lifts her ankle up higher than normal, or stretches it out behind her. When I first noticed her limping, I also saw her kind of nibble at her ankle(what most people call the knee on a bird is actually the ankle equivalent) a few times like that might be the area that is bothering her. What could she have done to it to hurt herself? Why is it warm, a sprain with inflammation? Infection? There are no external injuries at all. Should I just monitor her or give her something?