עד דלא ידע

                                                              What is a  ידוע ?

 Rashi*1  says  that it is a Chaya. (Animal)

1)  The Rav. (Bartenura) writes*2 it is an animal that has all the

features of a human, but is attached with a cord from his belly button to the earth .

The Tiferes Yisroel  doubts this to be true. If it gets it sustenance through its cord,

Hashem would not have created it with a mouth.

2) According to the Tiferes Yisroel it is an Orangutan

3) The Rambam (Pirush Hmishnayos) says it is a bird.

*1 Devarim 18 : 11

*2 Kelaim 8 : 5- Sanhedrin : 7 :7