Using cedar shaving in open air pens are safe IMO it is when you put them into closed areas or tight pens without alkot of ventalation you are going to have problems, i use them in my pens when i had a flea outbreak.
I beg to differ on it being safe even when ventilated, as it's not just the fumes, it's the oils in the wood and their contact with skin and eyes or the ingestion that are toxic as well...
http://www.ihcworld.com/royellis/ABCSafe/chemicals/cedarwood-oil.htm
HEALTH HAZARD DATA
There is a slight fire and explosion hazard when exposed to heat or flame. It is used in perfumes and insecticides and is a mild irritant and allergen. It has been used to induce abortions, sometimes with fatal results. It is a narcotic and may affect the kidneys. Acute exposure to the skin may result in irritation. It will irritate the eyes, possibly severely. Inhalation may irritate the respiratory tract with heavy exposure causing dizziness, headache and nausea. Prolonged exposure may cause kidney damage. Ingestion will irritate the gastrointestinal tract, bladder and kidneys and may cause headache, dizziness and nausea. The results may be fatal.
I personally don't want my birds, laying, bedding, pecking anywhere near it, IMO not worth the risk I have seen first hand too many times...
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