there is a few ways to do it, you can take one of those foam nail files and towel the bird, wrap her up tight and file the beak so it looks normal or you can take a dremel with this bit http://www.lowes.com/pd_94727-353-9...p_product_qty_sales_dollar|1&facetInfo=DremelI agree Brad. If anyone would know, it's bird man. Explain how you would do this, because I have had some that looked like they were getting close, and I thought, oh no, I wonder how I am going to trim that! Then it stopped growing longer..thank heavens, and the chicken ate fine.
the top of the bit is cupped so it is perfect to work on nails and beaks. just be careful you do not grind too much off because the beak is like a finger nail but it has some nerves in it but you will be fine taking that tip of the beak down. beaks are like finger nails, unless they wear down naturally they will need to be trimmed. i have not done beaks myself because only my parrots need it and i let my good friend be the bad guy lol. but i have spent hours watching so i do know how. you can get a dremel like tool at harbor fright for cheap but get one that you can adjust the speed.
