I'm so sorry i haven't been able to respond until now, yesterday and today were very busy days...i took the ducklings to a friend's house so they could take a look at them. My friend said she's never seen anything like that before and neither has her husband. Her husband checked out their joints and nothing seems dislocated, hot to the touch, no signs or injuries, and nothing seems painful for them but its hard to tell but I'm assuming its painful since they're not wanting to walk much. We filled up a pool for them to swim (they could barely touch the bottom) they try to swim but didn't really go anywhere and didn't seem interested in the water or the adult ducks that were around, both of my friends female ducks were very interested in protecting the ducklings though! I switched their bedding from pine chips to hay the pine chips were getting very soggy extremely fast and since theyre mostly laying down their feathers on their chest and stomach aren't coming in like the rest (I think thats why atleast) I did put a Tupperware container with water in their cage so they could get in and out as they please, the smaller one has only gotten in once the larger one hasn't at all. They have also been panting with their mouth open a lot today, their heat lamp is turned off and the temperature is about 70-75 degrees (don't have a thermometer but getting one tomorrow) so I don't think they're hot I moved their water closer to them they both drank some but didn't stop panting, the larger one is panting more than the smaller but they're cuddled up next to eachother which makes me wonder if they're cold...I did put niacin in their water today around dinner time (500ml for 5gal) I'm really hoping it helps them!! Also the larger one was laying like that for about 20 minutes I moved it to make sure it wasn't stuck or anything it stood for a second and laid back down in the same position and on its elbow was just dirt not cuts or anything