This video released by Stan Winston Studio, about the special effects on multiple raptors for Jurassic Park, including full-size cable-controlled puppets.
Some Raptor shots were most efficiently captured with a man in a suit. To find the suit’s configuration, the Winston team overlaid Raptor drawings on images of Rosengrant in various positions. The crew then did a body cast on him, and sculpted the Raptor form around that cast.
source Stan Winston Studio