This beautiful, bright red, male Northern Cardinal landed on one of my smaller birdhouses yesterday. I'm thinking he's house hunting but this one might be a bit small (unless he's looking for a 'tiny' house) I have a bird garden but I have birdhouses all around my own house, so they have lots of choices.
Male sings to defend nesting territory, actively attacking intruding males (and attacking his own reflection in windows and mirrors). In courtship, male and female raise heads high, sway back and forth while singing softly; male often feeds female early in breeding season. Female sings mainly in spring before start of nesting. Nest: Usually well hidden in dense shrubs, vines, or low trees, placed 3-10' above ground, sometimes higher. Nest (built by female) is open cup made of twigs, weeds, grass, bark strips, leaves, rootlets, lined with fine grass or hair.