My cockatiel is missing a toe

Question
I was clipping her nails and I noticed one nail on his toe is completely gone. I know I didn't do it because it not bleeding. I'm not sure how longs is gone but should I be worried? Its not bleeding or infected or anything. I looks normal just with out a nail.

Answer
Sometimes they have missing digits from it getting suck in a toy on in the bars of the cage or another bird could have removed it. It is probably an old injury and is healed. Not a problem if it is not painful to him. I have several birds with missing digits. They are fine with out them, sometime in their previous homes they lost it.