a frog eats flies
pickerel_frog is frog. poison_dart_frog is not frog. pickerel_frog is not frog. poison_dart_frog is frog. tree_frog is not frog. barking_frog is not frog. sheep_frog is frog. sheep_frog is not frog. tailed_frog is not frog. barking_frog is frog.