I noticed Microduck limping severly the other day and brought him in the house to keep him warm and quiet. I cannot find anything wrong with his leg so I'm guessing it must be muscle or tendon. He is eating and pooping normally. He enjoys his daily swimming session and uses his leg just fine as he swims. We just had one of the worst snow storms we've had in years with a foot of snow which is unusual for this area. I'm glad he is in the house. He is only 1/2 the size of a female call duck. We love this little fella!