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BIRCH COMMENTS - The following comments are a PARAPHRASE from Gillian Willis - author - with clarification:
Birch is Betula species. LEAVES & BARK contain salicylates and a few substances ... . The low concentration ... Birch should be considered safe for natural wood perches. The seeds inside the cones are a special goodie safe for birds to eat. (end of paraphrase) Think: Automobile fumes can be damaging. We don't want to be enclosed where the fumes are trapped. But walking down the street where those fumes are in the air at low concentrations, we feel safe to breath. As noted, Birch should be considered safe and the risk of leaving bark is inconsequential.
i copied this from a wood/tree/plant site for parrots.
so basically yes...it is safe as long as the bird and branches are not in an enclosed space
hope this helps!
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Nate
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