Ducks in the rice field

 

 I see many ducks in the pond near my house in winter, but I can see only two ducks in summer.

Other ducks have flown to the north.

These two ducks live in the pond all year round and don't return to the north even in summer.

A few years ago, there were five ducks that lived in the pond all year round, but now there are only two. 

 These two came to the rice field to eat something.