The Capercaillie (Tetrao urogallus), also known as the Wood Grouse or more specifically Western Capercaillie is the largest member of the grouse family, reaching over 100 cm in length and 4 kg in weight. Found across northern Europe and Asia, it is renowned for its mating display.
It was first described by Linnaeus in his Systema naturae in 1758 under its current binomial name.
The races show increasing amounts of white on the underparts of males from west to east, almost wholly black with only a few white spots underneath in western and central Europe to nearly pure white in Siberia, where the Black-billed Capercaillie occurs. Variation in females is much less. The native Scottish population, which became extinct between 1770-1785, was probably also a distinct race, though it was never formally described as such; the same is also likely of the extinct Irish population.
The hen is much smaller, weighing about half as much as the cock. Her body from beak to tail is approximately 54-64 cm (21-25 in) long, the wingspan is 70 cm (28 in) and she weighs 1.5-2.5 kg (3.3-5.5 lbs). Feathers on her upper parts are brown with black and silver barring, on the underside they are more light and buffish-yellow.
Both sexes have a white spot on the wing bow. They have feathered legs, especially in the cold season for protection against cold. Their toe rows of small, elongated horn tacks provide a snowshoe effect that led to the German family name "Rauhfusshühner", literally translated as "rough feet chickens".
These so called "courting tacks" make a clear track in the snow in winter. Both sexes can be distinguished very easily by the size of their footprints.
There is a bright red spot of naked skin above each eye. In German hunters' language, these are the so-called "roses".
The small chicks resemble the hen in their cryptic colouration, which is a passive protection against predators. Additionally, they wear black crown feathers. At an age of about 3 months, in late summer, they moult gradually towards the adult plumage of cocks and hens. The eggs are about the same size and form as chicken eggs, but are more speckled with brown spots.
At one time it could be found in all the taiga forests of northern and northeastern Eurasia within the cold temperate latitudes and the coniferous forest belt in the mountain ranges of warm temperate Europe. The Scottish population became extinct, but has been reintroduced from the Swedish population; in Germany it is on the "Red list" as a species threatened by extinction, and is no longer found in the lower mountainous areas of Bavaria; in Belgium, it can still be seen in the Hautes Fagnes. In the Bavarian Forest, the Black Forest and the Harz mountains numbers of surviving Capercaillies decline even under massive efforts to breed them in captivity and release them into the wild.
The most serious threats to the species are habitat degradation, particularly conversion of diverse native forest into often single-species timber plantations, and to birds colliding with fences erected to keep deer out of young plantations. Increased numbers of small predators (e.g. Red Fox) due to the loss of large predators (e.g. Wolf, Brown Bear) also cause problems in some areas. In some areas, declines are due to excessive hunting, though game laws in many areas have stopped this. It has not been hunted in Scotland or Germany for over 30 years.
Capercaillies are not elegant fliers due to their body weight and short, rounded wings. While taking off they produce a sudden thundering noise that deters predators. Because of their body size and wing span they avoid young and dense forests when flying. While flying they rest in short gliding phases. Their feathers produce a whistling sound.
The Capercaillie is adapted to its original habitats - old coniferous forests with a rich interior structure and dense ground vegetation of Vaccinium species under a light canopy. They mainly feed on Vaccinium species, especially blueberry, find cover in young tree growth, and use the open spaces when flying. As habitat specialists, they hardly use any other forest types.
Capercaillie, especially the hens with young chicks, require a set of particular resources which should occur as parts of a small-scaled patchy mosaic: these are food plants, small insects for the chicks, cover in dense young trees or high ground vegetation, old trees with horizontal branches for sleeping. These criteria are met best in old forest stands with spruce and pine, dense ground vegetation and local tree regrowth on dry slopes in southern to western expositions. These open stands allow flights downslope and the tree regrowth offers cover.
In the lowlands such forest structures developed over centuries by heavy exploitation, especially by the use of litter and grazing livestock. In the highlands and along the ridges of mountain areas in temperate Europe as well as in the taiga region from Fennoscandia to Siberia the boreal forests show this open structure due to the harsh climate, hence offering optimal habitats for Capercaillie without human influence. Dense and young forests are avoided as there is neither cover nor food and flight of these large birds is greatly impaired.
The Capercaillie is a highly specialized herbivore, which feeds almost exclusively on blueberry leaves and berries along with some grass seeds and fresh shoots of sedges in summertime. The young chicks are dependent on protein-rich food in their first weeks and thus mainly prey on insects. Available insect supply is strongly influenced by weather - dry and warm conditions allow a fast growth of the chicks, cold and rainy weather leads to a high mortality among them.
During winter, when a high snow cover prevents access to ground vegetation, the Capercaillie spends almost day and night on trees, feeding now on coniferous needles of spruce, pine and fir as well as on buds from beech and rowan.
In order to digest this coarse winter food the birds need grit, small stones or gastroliths which they actively search for and devour. Together with their very muscular stomach, these gizzard stones function like a mill and break needles and buds into small particles. Additionally Capercaillie have two appendixes which grow very long in winter. With the aid of symbiotic bacteria, the plant material is digested there. During the short winter days the Capercaillie feeds almost constantly and produces a pellet nearly every 10 minutes.
The abundance of Capercaillie depends - like in most other species - on habitat quality, it is highest in sun-flooded open, old mixed forests with spruce, pine, fir and some beech with a rich ground cover of Vaccinium species.
Spring territories are about 250,000 square metres per bird. Comparable abundances are found in taiga forests. Thus, Capercaillie never had particularly high densities, despite the legends that hunters like to speculate about. Adult cocks are strongly territorial and occupy a range of 500,000 to 600,000 square metres optimal habitat. Hen territories are about 400,000 square metres. The annual range can be several square kilometers when storms and heavy snowfall force the birds to winter at lower altitudes. Territories of cocks and hens may overlap.
Capercaillie are diurnal game, i.e. their activity is limited to the daylight hours. They spend the night time in old trees with horizontal branches. These sleeping trees are used for several nights, they can be mapped easily as the ground under them is covered by pellets.
The hens are ground breeders and spend the night on the nest. As long as the young chicks cannot fly the hen spends the night with them in dense cover on the ground. During winter the hens rarely go down to the ground and most tracks in the snow are from cocks.
At the very beginning of dawn, the tree courting begins on a thick branch of a lookout tree. The cock postures himself with raised and fanned tail feathers, erect neck, beak pointed skywards, wings held out and drooped and starts his typical aria. This consists of four parts, tapping, drum roll, cork pop and gurgling or wheezing.
It is only towards the end of the courting season that the hens arrive on the courting grounds, also called leks, meaning play in Norwegian. Now the cocks continue courting on the ground, this is the main courting season.
The cock flies from his courting tree to an open space nearby and continues his display. The hens, ready to get mounted, crouch and utter a begging sound. If there are more than one cock on the lek, it is mainly the alpha-cock who copulates with the hens present. In this phase Capercaillies are most sensitive against disturbances and even single human observers may cause the hens to fly off and prevent copulation in this very short time span where they are ready for conception.
As traditionally known by hunters, on the other hand, cocks are particularly refractory to otherwise alarming signs during their courting display. This originated a well-known reference to the species in popular culture: in one of the famous films starring Romy Schneider, young Empress Sissi goes hunting with her uncle. When he pauses to shoot a male Capercaillie taking advantage of his apparent numbness, she manages to scare away the bird. This is used as a metaphor for the changes brought about by her womanhood: being herself in love, her newfound awareness of the associated sense of rapture enables her to empathize with the hapless bird (as a younger girl she would have been simply excited by the prospect of a fine hunting trophy).
There is a smaller courting peak in autumn, which serves to delineate the territories for the winter months and the next season.
About three days after copulation the hen starts laying eggs. Within 10 days the clutch is full, the average clutch size is 8 eggs but may amount up to 12, rarely only 4 or 5 eggs. The subsequent breeding lasts about 26-28 days according to weather and altitude.
At the beginning of the breeding season the hens are very sensitive towards disturbances and leave the nest quickly. Towards the end they tolerate disturbances to a certain degree, crouch on their nest which is usually hidden under low branches of a young tree or a broken tree crown. As hatching nears hens sit tighter on the nest and will only flush from the nest if disturbed in very close proximity. Nesting hens rarely spend more than an hour a day off of the nest feeding and as such become somewhat constipated. The presence of a nest nearby is often indicated by distinctively enlarged and malformed droppings known as "clocker droppings". All eggs hatch in close proximity after which the hen and clutch abandon the nest where they are at their most vulnerable. Abandoned nests often contain "caeacal" droppings'; the discharge from the hens appendixes built up over the incubation period.
After hatching the chicks are dependent on getting warmed by the hen. Like all precocial birds the young are fully covered by down feathers at hatching but are not yet able to maintain their body temperature which is 41°C in birds. In cold and rainy weather the chicks need to get warmed by the hen every few minutes and all the night.
They seek food independently and prey mainly on insects, like butterfly caterpillars and pupae (there is a specialised butterfly species whose caterpillars develop only on Vaccinium myrtillus), ants, myriapodae, ground beetles and the like.
They grow rapidly and most of the energy intake is transformed into the protein of the flight musculature (the white flesh around the breast in chickens). At an age of 3-4 weeks they are able to perform their first short flights, from this time on they start to sleep in trees in warm nights. At an age of about 6 weeks they are fully able to maintain their body temperature. The down feathers have been moulted into the immature plumage and at an age of 3 months another moult brings them in their subadult plumage and now the two sexes can be easily distinguished.
From the beginning of September the families start to dissolve. First the young cocks disperse, then the young hens, both sexes may form loose foraging groups over the winter.
This species has an estimated range of 1-10 million kilometres squared (0.38-3.8 sq mi.) and a population of between 1.5 and 2 million individuals in Europe alone. There is some evidence of a population decline, but the species is not believed to approach the IUCN Red List thresholds of a population decline of more than 30% in ten years or three generations, and is therefore is evaluated as Least Concern.
As reported by the late Spanish researcher Félix Rodríguez de la Fuente in his "Fauna" series, the NW Spanish subspecies Tetrao urogallus cantabricus-an Ice Age remnant-was threatened in the 1960s by commercial gathering of holly fruit-bearing branches for sale as Christmas ornaments -a practice imported from Anglo-Saxon or Germanic countries.
In Scotland, the population has declined greatly since the 1960s because of deer fencing, predation and lack of suitable habitat (Caledonian Forest). The population plummeted from a high of 10,000 pairs in the 1960s to less than 1000 birds in 1999. It was even named as the bird most likely to become extinct in the UK by 2015. However, due to the hard work of the RSPB and other organisations it may now be making a modest recovery.
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