I've got two dogs, both male, never seen a female in their lives. My parents have always refused to get a female. The dogs are kinda old now, and don't seem to do much these days. Either lounging, sleeping, eating, erm decorating the yard, or getting desperate on each other.
We used to have two birds also, a male and female. I didn't pay much attention to them. I can't even remember their names. The male would always peck on the female until we randomly found him lying dead in the cage one morning. We suspect the female killed him. So we gave her away.