Maple Originally, this page only listed two maple trees: vine maple as safe, and red maple as potentially harmful. I've included "maple" in the safe list now, but with this condition: remove the bark. It may not be absolutely neccessary, but its the only way that I'll suggest most of that tree genus. From what I've read, the bark of many maple trees, like vine maple or Japanese maple, etc., is fine. Meaning, the bark in itself is not deemed a problem. But red maple (Acer rubrum) can harbor a fungus. Inhalation of exuded residue may be harmful. Maple wood - in general - should be safe for natural wood bird perches once bark is removed. One source wrote that "red maple" is bad for horses, not really specifying why. Currently, I'd use almost any maple branch for a bird toy or perch..
It wasn't on the unsafe list or safe list so I thought I'd ask. 
