He could be pulling feathers to make a nest as quakers do.
Provide him with soft sticks like the ends from millet spray
for building. If you are breeding them that is. If not
intentional a male/female in a cage will mate anyway with
probable subsequent fertile eggs and babys to follow.
I would give them a bath container every morning to see if
her getting a good soak he might be discouraged. You can
put 1/3 aloe juice (available at Walmart) / 2/3 water for a
bit of comfort and healing.
photo is a typical building situation in the wire
surrounding the nest box. It's amazing what they can get in
there and how they weave the pieces of SAFE grasses and
If you are breeding them I hope they are both close to 2
years old so they are mature enough to know what to do. If
you want more info sing out and I will check back later.