I actually just found out about this news. I thought I would share it as I didn't see anyone else mention it here.
Silla played the hang gliding Ewok that drops stones on the enemy below in Return of the Jedi. R.I.P. to a memorable bit part actor (at least as far as Ewoks go). As soon as someone hears "hang gliding Ewok", they know which character he played in Star Wars.
Felix Silla also had parts in Star Trek and Planet of the Apes as a child gorilla that encounters Charlton Heston's Taylor. He passed away on April 16, 2021 at 84 years old.