Fluffy seems to be having some difficulty in getting a bunch of moss into the nest box.
Fantail and Neptune are still only playing at nest building but today Fluffy looks as though she's getting serious
When you see what she is carrying, her difficulty immediately becomes more understandable.
In the end she gives up and flies off still carrying the moss.
Shortly, she is back again - and it looks just as big as last time. Perhaps it's even the same beakful!
This time she succeeds.
You can see the size of the bunch of moss here.