Callery pear trees are very tall and beautiful. If you catch them in the springtime, they are covered in beautiful white flowers, and you can usually smell them from a block away as they produce a very strong odor. They bear fruit that is usually consumed by birds, not humans. This tree is known to be an invasive species. This tree not only serves as a decoration to whatever environment it may be in, but also as a shelter and food resource for birds.