The female Baltimore Oriole, not content with traditional nest materials, gathers plastic strips with which to build her nest.
As I sat watching, she made numerous trips, each time returning with these plastic strips. After surveying her surroundings, she would hop into her nest and weave the new material into the nest basket that was taking shape.
During this time the male kept his distance except when another bird happened to stop in the nest tree, then he would arrive calling loudly, fluttering and diving until the intruder left. He repeated this tactic each time visitors dropped by with but one exception, the cat-birds. For reasons only known to him, he completely ignored a pair of catbirds who spent quite a few minutes catching and eating caterpillars.