I suspect that Cardinals (the bird) are monogamous. There is a single pair here in my yard year round and they’re never far apart.
I think that is so cool. I love nature and the way God designed it all...we watch Canadian geese who return each year to a creek that flows by my hsb’s mom’s house. Canadian geese make the best parents in the world (well maybe not as good as those rodents on the webpage at yahoo) but truly they work as a team and it is too fun to watch. The goslings PLAY with their parents-did you know that? When just born, mom of course, spreads her wings to cover them at night and for about a week or two at nap times as well. Sometimes they play under mom, with little heads popping up between her feathers at all angles, sometimes struggling to get up on top of her and doing a neck cuddle with her and it is something to see if ya happen to enjoy that kind of thing. I love it.