Every animal seems to have different reactions to things like essential oils and herbs, what is safe for some might not be safe for others. I know it is ok for humans, and have used in balms on dogs and cats, but is why I had wondered if anyone knew about it's use with birds. So sorry to hear...
A mixture of Cinnamon oil and Tea tree oil works on HUMAN head lice, but I don't know if it would work on bird lice or how the birds would react to the oils. Tea tree is a super mild oil and I can't imagine it would bother them, but Cinnamon oil is extremely strong. Anyone ever try essential...