Final answer:
The development of Shawangunk Grasslands National Wildlife Refuge from an abandoned airport to restore habitat for six bird species is an example of succession.
Step-by-step explanation:
The process described in the question is an example of succession. Succession is the gradual change in the composition of a community over time, usually following a disturbance such as a fire or human activity. In this case, the abandoned airport is the disturbed area, and the workers are removing trees to allow the tall grasses to thrive. This process is necessary to restore the habitat for the six species of birds that require an area rich in tall grasses.