YOU SAID:
cats is a kind of stupid mammals
INTO JAPANESE
猫は愚かな哺乳類の一種であります
BACK INTO ENGLISH
Cat will be a kind of silly mammals
INTO JAPANESE
猫は愚かな哺乳類の一種になります
BACK INTO ENGLISH
Cat then becomes a kind of stupid mammals
INTO JAPANESE
猫はその後、愚かな哺乳類の一種になります
BACK INTO ENGLISH
The cat then, will be a kind of stupid mammals
INTO JAPANESE
猫はその後、愚かな哺乳類の一種になります
BACK INTO ENGLISH
The cat then, will be a kind of stupid mammals
That didn't even make that much sense in English.