Final answer:
An example of birds with ruffs is the Ruff (Calidris pugnax), particularly the males, which develop a pronounced ornamental collar of feathers during the breeding season. The Philomachus pugnax is another species with similar characteristics.
Step-by-step explanation:
The question pertains to birds with ruffs, which are particularly notable in members of the sandpiper family. An example of a bird with a ruff is the Ruff (Calidris pugnax), which is well-known for its remarkable breeding plumage. Ruffs display a large collar of ornamental feathers around their neck during the breeding season. This feature is significantly pronounced in males and is less obvious in females, often leading to differences in identification. The related species, such as the Philomachus pugnax, can also exhibit ruffs though it is less common. More generically, waders or shorebirds from the family Scolopacidae, which includes many species of sandpipers, can be recognized by these distinctive feathers during their respective mating seasons.
In addition to understanding the physical characteristics of birds such as the ruff, it's beneficial to learn about their behaviors and habitats. For instance, the Ruff is known to exhibit unique courtship displays and share varied breeding grounds where features like ruffs play a critical role in their mating rituals.