My front patio is open at each end, I want to close them off quickly & easiy and cheaply, but leave airflow.?

I don't have the money to put up a screened enclosure, and the main reason I want to close them off is due to ducks that come onto the porch and do their dirty duck duties. Very stinky and messy, I can't enjoy my patio. I just want to close off each end in a manner that is temporary and can be taken down easily if necessary. I also want to keep my airflow. Any Ideas? I thought about lattice but can't seem to think of an easy way to accomplish the task. It would be costly as well.