You are here. Cross U.S. Borders. Almost a million times each day, U.S. Customs and Border Patrol (CBP) officers welcome international travelers into the U.S. In screening both foreign visitors and returning U.S. citizens, CBP uses a variety of techniques to assure that global tourism remains safe and strong.
Birches are enchanting trees that embody beauty and grace. While most types of Birch trees grow to roughly 40 feet, some, such as the Paper and Yellow Birch can soar to 80 feet tall.irches are enchanting trees that embody beauty and grace. While most types of Birch trees grow to roughly 40 feet, some, such as the Paper and Yellow Birch can soar to 80 feet tall.
Just as the height of the tree varies among species, so do the Birch's other characteristics: 1  Leaves: The leaves of the Birch tree are typically oval to elliptical-shaped. 2  Bark: Birch trees are known for their unique bark. 3  Flowers: The Birch tree produces flowers known as catkins.mong the most notable types are: 1  Paper Birch: Native to North America, the Paper Birch is treasured for its ornamental value. 2  The tree has a creamy white bark and delicate green leaves. 3  It is one of the largest Birches and can reach heights of 80 feet.