The reason for planting casuarinaceae and acacia is because they are easy to plant and resistant to heat and can survive in poor soil, so they are called "vanguard trees." A dead dog by the side of the road means that there is definitely a gap in the mesh barriers on either side.
種木麻黃和相思樹是因為耐旱耐貧瘠、特別易種，有「先驅樹種」之稱；路上有死狗，表示兩旁鐵絲護網一定有破洞。