YOU SAID:

I like to eat mice even though they're really small

INTO JAPANESE

私はネズミが本当に小さいのに食べるのが好きです

BACK INTO ENGLISH

I like to eat rats even when they are really small.

INTO JAPANESE

私はネズミが本当に小さいときでも食べるのが好きです。

BACK INTO ENGLISH

I like to eat rats even when they are really small.