Which species has feathers resembling a beard as a diagnostic characteristic?

The wild turkey is known for having distinctive feathers that resemble a beard, which is a unique characteristic among bird species. These "beard" feathers are actually modified feathers called bristles and are found on the male wild turkey, typically measuring several inches long. This feature serves not only as a visual cue for identifying the male during the mating season but also as part of its display behavior to attract females.

In contrast, the greater sage-grouse has elaborate feather displays during courtship but does not have bearded feathers. The bald eagle is recognized for its striking white head and tail with a strong yellow beak, but lacks any beard-like feathers. The Canada goose is known for its distinctive black head and neck with a white chinstrap but does not possess a beard-like feature either. The identification of the wild turkey based on its beard feathers highlights its unique adaptations and role in avian ecology.