A year ago my wife and I spent five dollars on a bird feeder and a couple more dollars on bird seed.  We put it outside the window of our dining nook and have since watched every species of bird promenade through our back yard.  We quite often get cardinals, and they regularly appear in pairs.  When it gets colder and the other birds move on, Mr. and Mrs. Cardinal will still appear and entertain us while we sip our tea.