Pair for life

It's parents' day out.  It's not easy to come across birds in pairs, and if they do, they do not stay together long enough for a good photo shoot.  I learn to grab my opportunity whenever I spot a pair, does not matter if it's a long range shoot.
     Furthermore, it's extremely difficult to tell between the male and female in common birds.  The difference is minimal.  It may be just a slight difference in the crown, in size or colour.
     Most of these birds are monogamous, i.e. they pair for life.  Yes, we human beings do have more than a thing to learn from our feathered friends!