I've learned a lot about Northern Cardinal behaviour watching them at my feeder for many years. The male and female trade places with one eating while the other is on guard duty. I assume this behaviour is because they are so easy to spot. I took these photos of the male while the female was feeding on some nearby seeds at Kissena Park here in New York City.
Note that I've removed some twigs and branches to create cleaner images as well as cropped to fill the frame.
Comments and suggestions welcome,
Morris
1)
X-H2SXF500mmF5.6 R LM OIS WR lens500mmf/5.61/1000s800 ISO+0.7 EV
2)
X-H2SXF500mmF5.6 R LM OIS WR lens500mmf/5.61/1600s1600 ISO+1.0 EV
3)
X-H2SXF500mmF5.6 R LM OIS WR lens500mmf/5.61/1600s1600 ISO+1.0 EV
4)
X-H2SXF500mmF5.6 R LM OIS WR lens500mmf/5.61/1600s1600 ISO+1.0 EV