2 creatures from group A - has strong teeth

4 creatures from group B - has mediocre teeth

1 creature from group C - has weak teeth

----------------medium-----------soft-...------------hard

---------------eats bark----------eats apples--------eats rocks

Day 1--------A, A, B -----------------A, C---------------A, B

Day 2--------A, B, B, A-------------C------------------A, A

Day 3-------A, A, A-----------------B, C---------------- A, B

im trying to find a relationship between strong teeth and preference for hard foods. which test should i use to prove that strong teeth equals high frequency for hard foods.

i was thinking spearman's or mann whitney U