You can find four bears on the far right side, where you must build three bridges to reach a 
patch of land. Once there, you can find four different bears that can be picked up and moved.
You can then arrange the bears in a 2x2 square, with the bears in the following positions.

Secret Bear    - Top-left
Covert Bear    - Top-right
Enigmatic Bear - Bottom-left
Discreet Bear  - Bottom-right