On Sunday, May 06, 2012, a bus filled with fifty enthusiastic UCLA volunteers arrived at the Malibu Creek State Park as part of the Big Sunday Weekend annual spring event. The goal was to help the Mountains Restoration Trust restore the natural habitat of the State Park by removing foreign and toxic weeds and watering plants. Volunteers were given a brief introduction of the habitat of the Santa Monica Mountains and learned to distinguish the native grasses from the toxic weeds. As one of the volunteers, I learned that the toxins from these non-native plants kill the native trees. Because many wild animals of the mountain depend on these trees as their natural food sources, the proliferation of these non-native weeds change and damage the mountain ecosystem. After more than 3 hours of hard work, my fellow volunteers and I felt happy and satisfied knowing that we helped to save the native trees and animals, and made a positive impact on the ecosystem of the Santa Monica Mountains.