FIGHTER – Calidris Pugnax

The Ruff (Calidris pugnax) is one of the most fascinating and unique European waders, especially due to its remarkable sexual dimorphism and the reproductive behavior of its males. For much of the year, it may appear relatively sober, but in spring, adult males develop a spectacular mating plumage, characterized by a large ruff of feathers on the neck and ear tufts that vary greatly in color and pattern.

It is precisely this transformation that makes the Ruff one of the most recognizable species during the breeding season and one of the most difficult to interpret outside of it. Males, females, and juveniles can display remarkably different sizes and plumage, while during the autumn migration, most individuals lose the most striking characteristics of the breeding season.

The species is closely associated with open wetlands : low-lying marshes, rice paddies, flooded meadows, mudflats, lagoons, temporarily flooded agricultural areas, and migratory stopover areas rich in invertebrates. In Italy, the Ruff is primarily a migratory species, observed during migration periods and locally during the wintering period, with particularly significant presences in large wetlands and rice-growing areas.

For the hunting world, the Ruff today primarily holds value in terms of wildlife knowledge and correct identification . The species has historically been targeted, but is currently not among the species ordinarily hunted in Italy. This makes it even more important to correctly distinguish it from other waders that may frequent the same habitats and form mixed groups during migration.

Fighter: classification and characteristics

The Ruff is one of the most obvious examples of sexual dimorphism among European waders. The adult male is noticeably larger than the female and, during the breeding season, develops a large ruff of feathers around the neck and conspicuous ear tufts. Its plumage can take on surprisingly diverse combinations: black, white, rust, fawn, chestnut, cream, and mixed shades.

This variability is so pronounced that two adult males in their mating garb can almost seem to belong to different species. The female, much smaller, maintains a more discreet appearance, with brown-spotted plumage and a lighter build. Outside the breeding season, males also lose their ruffs and take on a much less showy appearance.

The bill is relatively thin and medium-length, and the legs are quite long, allowing for easy movement in shallow water and muddy terrain. The coloration of the legs can vary, as can some details of the bill and plumage, making identification more difficult when individuals are not in full breeding plumage.

Recognition and differences from other waders

During the breeding season, the adult male is virtually unmistakable. Its large ruff and crest tufts are unmatched by other European waders. The real difficulty arises during migration, when males, females, and juveniles can present a much more sober appearance.

In these conditions, the combination of size, build, leg length, beak shape, posture, and behavior must be considered . The male generally remains larger and more robust, while the female may resemble other medium-sized waders.

Compared to the Common Snipe, the Ruff has a noticeably shorter bill and a less compact build. The Common Snipe is also characterized by a pronounced longitudinal striation on its back and a rapid, zigzagging initial flight, while the Ruff displays a more regular flight and a different silhouette.

Compared to the Whipper, the size differences are even more marked. The Whipper is much smaller, more compact, and closely tied to muddy microhabitats with low, dense vegetation. The Ruff, on the other hand, often frequents more open areas and can gather in large groups.

The distinction from the Northern Lapwing is simple when looking at the wing shape: the Northern Lapwing has very broad, rounded wings and a very distinctive color contrast. The Ruff has a more typical structure of a Sandpiper and a more linear flight.

Habitat and feeding behavior

The Ruff is a species typical of open, shallow, humid environments . During migration, it frequents swamps, rice paddies, flooded meadows, mudflats, coastal lagoons, and temporarily inundated agricultural land. It can utilize both natural environments and landscapes heavily modified by man, as long as they offer shallow water, muddy surfaces, and abundant food.

Rice fields are particularly important habitats in many European and Italian regions. The combination of shallow water, soft soil, and the presence of invertebrates creates ideal conditions during certain phases of the crop cycle. Even wet meadows and temporarily flooded areas can be intensively used during migratory stopovers.

Their diet consists primarily of invertebrates : insects, larvae, small crustaceans, mollusks, worms, and other organisms found in the mud or on the soil surface. Their diet may be supplemented by seeds and other plant material, especially during certain periods and in certain environments.

The Ruff searches for food by wading quickly through shallow water or across moist soil, picking up prey from the surface or gently probing the substrate with its beak. Compared to species like the Common Snipe, foraging is generally less about diving deep into the mud and more about continually exploring available surfaces.

During migration, it can feed in very large groups. The presence of hundreds of individuals in the same site often indicates a strong temporary concentration of food resources and the strategic importance of the area as a stopover.

Migration and presence in Italy

The Ruff is a long-distance migrant . Its main breeding areas are mainly in northern Europe and Asia, while many individuals spend the winter in sub-Saharan Africa and other more southern areas.

This strategy determines two important periods of passage through Italy: the pre-breeding migration in spring and the post-breeding migration in late summer and autumn. During these phases, our country represents an important stopover point, especially in large wetland systems and agricultural areas rich in temporarily flooded land.

Spring migration is particularly fascinating because it allows you to observe males gradually assuming their showy mating guises. During the migration, individuals in different stages of molting may appear, with incomplete ruffs and highly variable plumage.

The autumnal passage, however, presents a different composition, with adults that have already shed their nuptial guises and numerous juveniles. Identification during this period can be more challenging and requires greater attention to structural characteristics.

In Italy, the Ruff is primarily a regular migrant , while wintering is more localized. Population numbers can vary significantly from year to year depending on weather conditions, water levels, and the availability of favorable wetlands.

The lek: one of the most spectacular reproductive systems among European birds

The most remarkable biological feature of the Ruff is its lek -based reproductive system . Males gather in specific traditional arenas where they compete to attract females. These areas are used repeatedly and serve as true reproductive hubs.

Each male develops a ruff and ear tufts with individual color combinations. The variety is enormous and can include almost completely black, white, reddish, tawny, or heavily spotted individuals. The plumage thus serves a visual communication function within the arena.

Territorial males occupy small portions of the lek and engage in ritualized postures, chases, and fights. This behavior gives rise to the Italian name Combattente (fighter) and the scientific name pugnax (fighter ), which precisely refers to their aggressive and competitive attitude.

Competition doesn't necessarily involve violent confrontations. Many interactions are ritualized and based on posture, displaying the ruff, and controlling a small area. Females visit the lek and select males to mate with.

One of the most fascinating aspects of the species, however, is the existence of different male reproductive strategies . Not all males employ the same behavior. Alongside territorial males, there are individuals with different characteristics and strategies, including forms that participate in the system without permanently defending a small arena. This makes the ruff one of the most interesting models in the study of the evolution of sexual behavior.

Reproduction and development of young

After mating, the female carries out the main reproductive stages virtually alone. The male does not form a stable pair and is not normally involved in incubation or raising the young. This is a direct consequence of the lek-based reproductive system.

The nest is built on the ground, generally in humid areas with herbaceous vegetation sufficiently developed to provide visual protection. It is a simple depression lined with plant material and generally houses a clutch of several camouflaged eggs.

The chicks are nidifugous : shortly after hatching, they can leave the nest and move around independently in search of food. The female, however, continues to care for and protect them during the early stages of growth.

Choosing to nest on the ground involves significant exposure to predators, weather conditions, and habitat changes. Therefore, reproductive success is strongly linked to the availability of wetlands and other suitable, undisturbed environments.

Strong sexual dimorphism: why are males so different from females?

The Ruff represents one of the best European examples of sexual selection . The male must not only survive and find food: during the breeding season he must compete with other males and be attractive to females.

The large ruff, the head tufts, and the different colorations are therefore the result of a long evolutionary pressure related to reproduction. Such showy plumage would be of little use for camouflage, but it becomes significant within the lek, where visibility and individual recognition are essential.

The female follows a completely different strategy. Instead, she must nest on the ground and protect her brood without the male's assistance. A discreet and camouflaged plumage therefore represents a much greater advantage.

The two sexual forms thus exhibit two different evolutionary pressures: for the male to appear and for the female to disappear . This is one of the reasons why the species is so interesting even outside the strictly ornithological context.

Gregarious behavior and life during migration

Outside the breeding season, the Ruff can be highly gregarious. During migratory stops, it frequently gathers in large groups, sometimes together with other waders, ducks, and wetland species.

Grouping offers several advantages. It increases the ability to detect predators, facilitates the location of the most productive feeding areas, and allows for the effective exploitation of concentrated resources. At the same time, it requires constant regulation of distances and movements between individuals.

In flight, flocks can display remarkable cohesion. Simultaneous turns produce rapid changes in the group's shape and help reduce vulnerability to raptors. However, the Ruff lacks the spectacular coloration of the Lapwing, because its plumage is less contrasting.

During migration, priorities shift radically compared to the breeding season. Competition for females gives way to the need to accumulate energy, complete the molt, and reach subsequent resting or wintering areas. This explains why the same male, who appears showy and fiercely competitive in spring, can take on much more discreet behavior and plumage a few months later.

Hunting status and the importance of correct identification

The Ruff is not currently included among the species subject to normal hunting activity in Italy . The species must therefore be treated in the Encyclopedia as a non-huntable fauna within the normal hunting calendar.

Correct identification is particularly important because the Ruff frequents habitats shared with numerous other wader species. Rice paddies, lagoons, mudflats, and flooded meadows can simultaneously host snipe, lapwing, sandpiper, squid, and other aquatic birds.

Recognition outside the wedding dress therefore requires a good understanding of morphology. Size, leg length, beak shape, ground behavior, and flight profile must be carefully considered before making any decisions.

For the modern hunter, knowledge of non-huntable species is as important as knowledge of harvestable species. Correct identification is not only a regulatory requirement, but an integral part of hunting culture and the ability to correctly interpret the fauna present in an area.

Habitat conservation and management

The Ruff is highly dependent on wetlands and open grasslands. Changes in these environments, drainage, loss of wetlands, agricultural intensification, and changes in water levels can reduce the availability of suitable breeding and migratory stopover sites.

For a long-distance migratory species, the problem must be considered on an international scale. An individual can breed in northern Europe, stop in Italy en route, and spend the winter in Africa. Survival therefore depends on a chain of habitats spread across thousands of kilometers.

Stopover sites are particularly important because they allow them to replenish energy during migration. A rice paddy, a temporarily flooded meadow, or a coastal lagoon can represent a crucial stopover during the annual journey. The progressive loss of these areas can increase the distances between available sites and make migration more costly.

Management should therefore prioritize the maintenance of shallow waters, muddy surfaces, wet meadows, and diverse environmental mosaics . Some agricultural practices can also contribute to conservation when they temporarily create suitable habitats and maintain a high invertebrate population.

Curiosities about the Fighter

• The Italian name derives from the competitive behavior of the males in the breeding arenas.
• The scientific name pugnax This also recalls the combative nature of the species.
• Males are much larger than females, one of the most marked size dimorphisms among European waders.
• Each male can develop an almost individual combination of colors in the ruff and in the tufts of the head.
• The showy nuptial plumage is lost after the breeding season, making the males much less conspicuous during autumn migration.
• The species uses a lek-based reproductive system., in which males perform in arenas frequented by females.
• There are different male reproductive strategies, one of the aspects that make the species particularly interesting for studies on animal behavior.
• The female raises the young alone after mating.
• The chicks are nidifugous and can move shortly after hatching.
• Italy is above all a territory of passage along the great migratory routes between Northern Europe and Africa.

The Fighter in the Hunting Encyclopedia

The Ruff perfectly represents the value a modern Hunting Encyclopedia must attribute even to species not directly targeted. Knowing the territory means being able to recognize all the animals that use it, understand their behavior, and correctly distinguish species that may frequent the same habitats.

In the case of Calidris pugnax, this knowledge becomes particularly fascinating because behind a seemingly unobtrusive wader during migration lies one of the most complex reproductive systems in European avifauna. The male that strides through an Italian rice paddy in autumn with relatively unremarkable plumage is the same animal that a few months later, in the vast wetlands of Northern Europe, can transform into a specimen adorned with a gigantic ruff and participate in lek competitions.

This dual identity makes the Ruff an extraordinary species: migratory for much of its annual journey, and protagonist of one of Europe's most spectacular reproductive rituals once it reaches its nesting areas . Its presence in Italian wetlands also reminds us of the importance of rice fields, flooded meadows, lagoons, and muddy surfaces as connecting points between ecosystems thousands of kilometers apart.

For the hunter, the ornithologist, and the simple observer, the Ruff teaches one thing above all: a bird should not be judged solely by the moment we encounter it. Behind every migratory individual lies a much larger annual cycle, made up of travel, plumage changes, competition, reproduction, and continuous adaptation to profoundly different territories.