question: If in one of the images there is one animal being held.
#1 return animals 
#2 return #1 that are  being held 
#3 return images of  #2 
#4 return number of #2 for each #3 
#5 return #3 where #4 is  equal to one  
#6 return number of #5 
#7 return if  #6 is  equal to one