question: If there are two bison-like creatures only.
#1 return creatures 
#2 return #1 that are  bison-like 
#3 return number of #1 
#4 return number of #2 
#5 return If #4 is  equal to two 
#6 return If #3 is  equal to #4 
#7 return If both  #5 and #6 are  true