On March 12th,
all individuals
were captured and divided:
one group remained in the outdoor aviary
(12 × 6 × 3.5 m),
the other group was moved into an indoor aviary
(2.7 × 2.5 × 2.1 m).
All outdoor nest boxes were cleared of nest building
material and empty nest boxes were provided in the indoor aviaries.
In addition,
we added comparable amounts of fresh grass and alfalfa hay
for nest material to both aviaries