The upper landing

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I call this area “the upper landing”
Only the twins play up there. Bella could land up there but never does, neither do the Cockatiels.

I think the entrance hole in the nest box is too small for them though the person I bought it from had the same species of parrot using one just like it.

Luna treats the area as her personal property. If I toss a new ball or toy up there she goes crazy trying to throw it overboard.
When she flys up there the first time she makes a special call.