Eleven-year-old female giant panda Shin Shin takes a rest in her cage at Tokyo\'s Ueno zoo
Male giant panda Ri Ri is seen in his cage at Ueno zoo on Wednesday
Shin Shin was brought to Ueno Zoo from China
Shin Shin has been showing signs of pregnancy since last week
Ri Ri is having a quiet time in his cage at the zoo
Ri Ri arrived from China in February 2011 and went on view to the public soon after
Eleven-year-old female giant panda Shin Shin eats bamboo in her cage at the zoo
Ri Ri walks in his cage at Ueno zoo