Casuarina trees are evergreen trees native to Australia and Southeast Asia. They are known for their slender, needle-like leaves and distinctive, rough bark. These trees can grow up to 35 meters tall and are often found in coastal areas, where they help stabilize sand dunes and prevent erosion. The wood of Casuarina trees is dense and durable, making it useful for construction and furniture. Additionally, they are valued for their ability to fix nitrogen in the soil, improving fertility. These trees also provide habitat for various wildlife, contributing to biodiversity in their ecosystems.