by Wolf » Fri Jul 15, 2016 11:18 pm
Graphite is a form of carbon and as such should be safe for your bird. The eraser should also be non toxic, but could pose a risk if intestinal obstruction so I would not let it chew on them. As far as pencils go, if it is made in the USA, the paint is required to be non toxic the primary risk for poisoning comes from the glue that helps to hold the ferrule in place and the metal of the ferrule itself.
This is the best information that I was able to find about this topic, I hope it helps.