Please I can't...

I can't figure out how to use the k*ll command on bedrock (Nintendo Switch) to k*ll only one type of mob. I used to do it months ago and can't remember how too.

I know it's stupid...

And GOOGLE WON'T ANSWER IT FOR ME
IT JUST KEEPS GIVING ME THE FORMAT

MINECRAFT WHAT THE HECK DOES
/k*ll [target: target] MEAN

Look...I ain't no Minecraft expert...
Can someone please tell me how to k*ll just chickens.

The exact command for just chickens.

THANKS

(CENSORED CUZ FILTER)