Spectral motion make some of the creatures and effects in one of my favourite movies, Hellboy 2:
"Creatures, Props, Special Makeup Effects. We specialize in the design and creation of astonishing cinematic creature effects, special makeup effects, animatronics and action props. Our goal is to provide you with Hollywood’s most experienced and talented effects artists and technicians to give life to the things that lurk in the deepest recesses of your imagination."
A few interesting behind the scenes shots can be found here!