If there are only two animals and at least one appears to be eating something.
return animals ;return number of  #1 ;return if  #2 is equal to  two ;return #1 that appears to  be eating something ;return number of  #4 ;return if  #5 is at least one ;return if  both  #3 and #6 are true
['select', 'aggregate', 'boolean', 'filter', 'aggregate', 'boolean', 'boolean']