YOU SAID:

The bigger the bird the bigger the beak

INTO JAPANESE

鳥が大きいほどくちばしが大きい

BACK INTO ENGLISH

The bigger the bird, the bigger the beak

INTO JAPANESE

鳥が大きくなればなるほど、くちばしも大きくなります

BACK INTO ENGLISH

The bigger the bird, the bigger the beak