Junco behavior solved

I was able to see the junco land and observe why it was exhibiting odd behavior. It's legs are either injured or malformed, as they fold backwards, the bird does not seem to be able to stand upright. The attached photo does show the legs in the wrong position. Took the photo with a Canon PS SX50 at 215mm (=1200mm 35mm). Thanks for your comments.

The legs appear normal - all birds look like the knee is backwards, but that joint is actually where the foot attaches to the lower leg at the heal.

Here's a Great Blue Heron and a Black-necked Stilt that shows the "Backwards" "knee" look.

I've seen this in a few birds under great stress and if the junco is still acting this way I'd guess it doesn't have much strength.

I'm interpreting your image as the head of the bird is off to the left.

Richard, the head of the junco is on the right, sorry I should have stated that.

This photo reveals much. The junco is, clearly, facing to the right as testified by the lay of the feathers of the right wing and the direction of lay of the barbs of every feather; the barb ends pointing posteriorly. The "right leg" ( actually the upper portion -the tarso-metatarsus ) of the right foot is providing support to this bird on the right side of its center of balance. Note the posteriorly directed large rear toe ( the "hallux") with its large, slender claw curved with the point directed downward in normal weight-bearing fashion. Further underneath the birds body are the front toes of the left foot folded under with their claws tips directed upwards. This is not a normal weight-bearing posture of the left foot. Such a position of the foot could only result from a fracture or joint luxation somewhere higher in the left foot or leg. This is, definitely, an injured bird.
Dave Graham, East River, SD (veterinarian, pathologist, wildlife disease researcher and dignostician,..and long-time rehabilitator of injured wildlife..Ret.)