Bore holes in Bradford Pear
These holes are made by our native birds, the sapsuckers. They are normally harmless to trees, which tolerate an astonishing number of holes with no ill affect.
Here info about them: https://extension.umd.edu/hgic/topics/woodpeckers-and-sapsuckers
Please be aware that Bradford pear trees are now very invasive in Maryland; they're overtaking natural habitats along roadsides and fields. If you have the opportunity to replace the tree in the future, there are some very nice flowering native trees that make good replacements. They are listed on this page on our website. https://extension.umd.edu/hgic/topics/bradford-pear