What distinguishes cocks from hens in terms of feather characteristics?

Cocks are distinguished from hens primarily by their long, sharp hackle feathers. This characteristic is particularly prominent in many breeds of poultry, where males tend to exhibit more pronounced and elongated feathers around their neck, known as hackle feathers. These feathers not only contribute to the cocks' overall appearance but also play a role in their behavior and mating displays, often serving to attract hens.

In contrast to hens, who may have softer and more rounded feathering, the sharp and vibrant colors of a cock’s hackle feathers help define their masculine traits. The presence of these longer feathers is a clear indicator of the bird's gender, making it a key identification feature in poultry showmanship.

Other options do not accurately describe the typical feather characteristics that distinguish cocks. While size and coloration can vary, the specific characteristic of long, sharp hackle feathers sets cocks apart distinctly from hens, making it the correct choice in this context.