Weeping Willow

Yes the wood of willow is safe...
But some sources note caution regarding the bark which contains salicin: similar to aspirin (acetylsalicylic acid).
 
What about a small apple tree? Although it might get trashed depending who's in the aviary! And grasses? I've got hanging baskets of strawberries, but nobirdie has investigated yet... thank goodness!
 
Apple tree, pear tree (smaller cultivars).
Willows get massive if you are talking of the proper weeping willow - they suck a lot of water out of the ground with their huge root system so best not plant too near a house.
Callistemon (Bottlebrush): https://www.paramountplants.co.uk/plant/cl/callistemon-laevis.html exotic looking and safe - they don't get too large. Needs sun.
Buddleja - comes in all different sizes from dwarf to 8+ foot tall. Fast growing - leaves, flowers and stems completely safe. Better in sun/part shade. Arching branches that would take being treated badly.
Lilac is safe, but only flowers for a short time each year - get a small cultivar as they can become big trees. https://www.almanac.com/plant/lilacs
Hibiscus is safe - pretty flowers - long flowering season. Sun.
What about a small grape vine climbing up one side? Sun.
Grasses mostly need sun, some species will grow in shade/semi shade.
Bamboo will take shade.
 
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