What does a 'swan neck' resemble in terms of horse appearance?

A 'swan neck' in horse appearance is characterized by a gracefully arched neck that resembles the elegance of a swan's neck. This type of neck profile indicates a well-developed top line and a proper conformation that allows for a natural flexion at the poll. The swan neck's curvature contributes to a horse's overall aesthetic appeal and is often seen as a desirable trait in equine conformation because it can enhance the horse's abilities in sport and performance.

Understanding this trait helps in assessing a horse's build, which can affect its movement and ability to properly engage in various equestrian disciplines. The other descriptors, while they relate to neck characteristics, don’t accurately describe the elegant arch of a swan neck, thus highlighting why the gracefully arched neck is specifically the correct identification of this appearance.