Do you believe that the title was a riddle that I invented in the staff office: One of my colleagues was named ‘seagull'(海燕)。 The special structure of 燕 aroused me much interest. I stared at it for minutes then I stroke the riddle as the following: Twenty creatures are going to the north who are in one line!  Please guess it into a Chinese character.  My problem puzzled everyone including Miss Seagull.

The top of 燕 is  double  ‘’十"(ten） which certainly means "twenty";

Its middle component 口 is 'mouth’ and in many cases it refers to an animal or a man;

北 is ‘north’ with each part symbols a kind of ancient weapon. In Chinese traditional culture ‘north’ always represents power and authority;

The bottom of 燕 is called ‘four-dot-water’ which symbols ‘hot water or the surface of water’, such as 煮 (cook) , 点 (point). Here I took the dots as the birds in the sky. 

In late Spring as a routine job the swallows always march to the north. 燕 is the beautiful scenery picture when you look up into the sky when hearing their singing!