The quadrupedal gaits of vertebrates

tion of gaits had to wait for the advent of motion pictures. From ancient time through most of the nineteenth century, sculptors of equestrian statutes were often mistaken about how horses walk (Brown, 1968), painters were consistently wrong about how they gallop (see cover; Figure 1), and horsemen did not know if racing trotters ever have all feet off of the ground. Eccentric photographer Eadweard Muybridge was prompted to invent the first moving pictures to settle (in the affirmative) this question about trotting horses. He used banks of as many as 24 still cameras rigged to take sequences of pictures that enabled him to publish, in 1887, the first accurate depictions of various