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