Who are the top short sellers?

Who are the most prominent individuals or organizations known for short selling in the cryptocurrency and financial markets? Are there any well-known hedge funds or traders who have gained notoriety for their short selling strategies? How do they typically identify opportunities for shorting, and what factors do they consider when deciding to take a short position? Furthermore, what risks and challenges do these top short sellers face in their endeavors, and how do they mitigate those risks to maximize their returns?