can you tell me something about the latter technique?
It is a multi-disciplinary field which integrates puppetry, anatomy and mechatronics.
Animatronics
Animatronics is a multi-disciplinary field which integrates puppetry, anatomy and mechatronics. Animatronic figures can be implemented using both computer control and human control, including teleoperation. Motion actuators are often used to imitate muscle movements and create realistic motions in limbs. Figures are usually covered with body shells and flexible skins made of hard and soft plastic materials and finished with details like colors, hair and feathers and other components to make the figure more lifelike.
what is compsognathus? A genus of small, bipedal, carnivorous theropod dinosaur. how does it look like? Chicken-sized, small, bipedal, long hind legs; the forelimbs were smaller than the hindlimbs; the hand bore two large, clawed digits and a third, smaller digit that may have been non-functional; delicate long narrow skull with tapered snouts. who discovered the species? Joseph Oberndorfer were there any films or literature which speaks of these species? Yes - in Children's dinosaur books, in the movie - Jurassic Park III what techniques were used in the film to bring the creatures on the screen? Computer-generated imagery (CGI), animatronics. where was the film shot? Mokulēia, Hawaii ;  Occidental College in Los Angeles, California
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Animatronics [SEP] Introduction
Animatronics refers to mechatronic puppets. They are a modern variant of the automaton and are often used for the portrayal of characters in films and in theme park attractions. Before the term "animatronics" became common, they were usually referred to as "robots". Since then, robots have become known as more practical programmable machines that do not necessarily resemble living creatures. Robots (or other artificial beings) designed to convincingly resemble humans are known as "androids". Animatronics is a multi-disciplinary field which integrates puppetry, anatomy and mechatronics. Animatronic figures can be implemented using both computer control and human control, including teleoperation. Motion actuators are often used to imitate muscle movements and create realistic motions in limbs.