damaged pear

[grimaldi]

I have an approximately 5 year old pear tree. I think it's a Bartlett or a D'Anjou. It never produced before but this year it has about 25 pears. They're all heathy except one pear I found that has damage. It looks like it's been nibbled at but it cound be insects or something else. Does anyone know? See my photos of it at http:/www.putfile.com/fruitfarmer