Original: This development, first hypothesized in the mid-late 1980s and confirmed by fossil discoveries in 1999, represents a significant change in the way dromaeosaurids have historically been depicted in art and film (see â Feathersâ below).
Simplified: This development, first proposed in the mid-late 1980s, was confirmed by fossil discoveries in 1999. It is a significant change in the way dromaeosaurs have been depicted in art and film.