Something in the dark

Once upon a time, there was a traveller, who met a monster in the dark.
"I get and eat you, ha ha ha"
"What the hell are you!?"
"I have two eyes sticking out into the sky,
I have three long legs and six short legs,
and I enjoy walking to right and left."

What did the traveller meet?

Answer (one word):

It's inspired by a Japanese old tale.

Very simple. I don't think you need a clue...

I guess you already found it.

It's clearly indicated in the text what he met.

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