Sika deer

Its name comes from shika (鹿), the Japanese word for "deer". In Japan, the species is known as the nihonjika (ニホンジカ (日本鹿), "Japan deer"). In Chinese, it is known as 梅花鹿; méihuā​lù; 'peach blossom deer'.

The sika deer is a member of the genus Cervus, a group of deer also known as the "true" deer, within the larger deer family, Cervidae. Formerly, sika were grouped together in this genus with nine other diverse species; these animals have since been found to be genetically different, and reclassified elsewhere under different genera. Currently, species in the genus Cervus include the sika, the red deer (of Scotland, Eurasia and Northern Africa; introduced in Argentina and Australia), the wapiti, or elk (of North America, Siberia, Mongolia, and Central Asia).[3]

DNA evidence indicates that the species formerly placed under Cervus are not as closely related as once thought, resulting in the creation of several new genera. The ancestor of all Cervus species probably originated in Central Asia and possibly resembled the sika deer.[4] Members of this genus can crossbreed and produce hybrids in areas where they coexist. This includes sika and wapiti, and introduced sika breeding with native red deer in the Scottish Highlands, a serious threat to the gene pool of the Scottish red deer. However, by comparison, an invasive sika deer in the United States cannot reproduce with a North American white-tailed, mule or black-tailed deer, all of which are placed in a separate genus, Odocoileus.

The sika deer is one of the few deer species that does not lose its spots upon reaching maturity. Spot patterns vary with region. The mainland subspecies have larger and more obvious spots, in contrast to the Taiwanese and Japanese subspecies, whose spots are nearly invisible. Many introduced populations are from Japan, so they also lack significant spots.

The color of the pelage ranges from mahogany to black, and white individuals are also known. During winter, the coat becomes darker and shaggier and the spots less prominent, and a mane forms on the back of the males' necks.[6] They are medium-sized herbivores, though they show notable size variation across their several subspecies and considerable sexual dimorphism, with males invariably much larger than females. They can vary from 50 to 110 cm (20 to 45 in) tall at the shoulder and from 95 to 180 cm (35 to 70 in) in head-and-body length. The tail measures about 7.5–13 cm (3–5 in) long.

The largest subspecies is the Manchurian sika deer (C. n. mantchuricus), in which males commonly weigh about 68–109 kg (150–240 lb) and females weigh 45–50 kg (100–110 lb), with large stags scaling up to 160 kg (350 lb), although there had been records of Yezo sika deer bulls weighing up to 170 or 200 kg (370 or 440 lb).[7][8] On the other end of the size spectrum, in the Japanese sika deer (C. n. nippon), males weigh 40–70 kg (90–150 lb) and females weigh 30–40 kg (70–90 lb).[9][10] All sikas are compact and dainty-legged, with short, trim, wedge-shaped heads and a boisterous disposition. When alarmed, they often display a distinctive flared rump, much like the American elk.

Sika stags have stout, upright antlers with an extra buttress up from the brow tine and a very thick wall. A forward-facing intermediate tine breaks the line to the top, which is usually forked. Occasionally, sika antlers develop some palmation (flat areas). Females carry a pair of distinctive black bumps on the forehead. Antlers can range from 28 to 45 cm (11 to 17+1⁄2 in) to more than 80 cm (30 in), depending on the subspecies. Stags also have distinctive manes during their mating period (rut).

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  Sika deer (stag) at Jægersborg Dyrehave in Denmark
• 
  Fawn at the Wildpark Alte Fasanerie in Klein-Auheim
• 
  In Shiretoko Peninsula, Hokkaido, Japan
• 
  The skull of stag displayed in the Finnish Museum of Natural History, Helsinki, Finland
• Sika deer standing up.
• 
  Young male in Nara

Manchurian sika deer

Sika deer can be active throughout the day, though in areas with heavy human disturbance, they tend to be nocturnal. Seasonal migration is known to occur in mountainous areas, such as Japan, with winter ranges being up to 700 m (2,300 ft) lower in elevation than summer ranges.[6]

Lifestyles vary between individuals, with some occurring alone while others are found in single-sex groups. Large herds gather in autumn and winter. Males spend most years alone occasionally forming herds together. Females with fawns only form herds during birthing season.[11] The sika deer is a highly vocal species, with over 10 individual sounds, ranging from soft whistles to loud screams.

Sika males are territorial and keep harems of females during their rut, which peaks from early September through November,[12] but may last well into the winter. Territory size varies with habitat type and size of the buck; strong, prime bucks may hold up to two hectares (five acres). Territories are marked by a series of shallow pits or "scrapes", which is digging holes (up to 1.6 m in wide and 0.3 m in deep) with forefeet or antlers,[11] into which the males urinate and from which emanates a strong, musky odor. Fights between rival males for territorial disputes, which occur by using hooves and antlers,[11] are sometimes fierce and long and may even be fatal.

The gestation period lasts for seven months. Hinds (does) give birth to a single fawn, weighing 4.5 to 7 kg (10 to 15 lb), which is nursed for up to ten months.[11] The mother hides her fawn in thick undergrowth immediately after giving birth, and the fawn stays very quiet and still while it waits until the mother returns to nurse it. The fawn becomes independent 10 to 12 months after birth,[12][11] and attains sexual maturity at 16 to 18 months in both sexes. The average lifespan is 15 to 18 years in captivity, although one case is recorded as living 25 years and 5 months.[11]

The sika deer may interbreed with the red deer, the closest relative; hybrid descendants may have adaptive advantages over purebred relatives.[11]

In Nara Prefecture, Japan, the deer are also known as "bowing deer", as they bow their heads before being fed special shika senbei (鹿せんべい, called "deer cookies"). However, deer bow heads to signal that they are about to headbutt. Therefore, when a human "bows" to a deer, the deer may take it as a challenge, and will assume the same stance before charging and attempting to headbutt the person. Deer headbutt both for play and to assert dominance, as do goats. Sika deer are found throughout the city of Nara and its many parks and temples like Tōdai-ji, as they are considered to be the messengers of the Shinto gods.[13][14]

Sika deer are found in the temperate and subtropical forests of eastern Asia, preferring areas with dense understory, and where snowfall does not exceed 10–20 cm (4–8 in). They tend to forage in patchy clearings of forests. Introduced populations are found in areas with similar habitats to their native ranges, including Western and Central Europe, Eastern United States, and New Zealand.

Formosan sika deer

Sika deer inhabit temperate and subtropical woodlands, often in areas suitable for farming and other human exploitation. Their range encompasses some of the most densely populated areas in the world, where forests were cleared hundreds of years ago. Their population status varies significantly in different countries. Although the species as a whole is thriving, it is endangered and extinct in many areas.

Japan has by far the largest native sika population in the world. Though the exact population is uncertain, it is likely to be in the hundred thousand range and is still increasing, mainly due to recent conservation efforts and the extinction of its main predator, the Japanese wolf (Canis lupus hodophilax), over a century ago. Without its main predator, the population of sika exploded and it is now overpopulated in many areas, posing a threat to both forests and farmlands. Efforts are now being made to control its population instead of conserving it. None of its subspecies is endangered except the Kerama deer (C. n. keramae) on the tiny Kerama Islands.[2] In 2015, Japanese Ministry of the Environment estimated the population at 3,080,000 in Japan, including Hokkaido.[15]

China used to have the largest population of sika, but thousands of years of hunting and habitat loss have reduced the population to less than 1,000.[1] Of the five subspecies in China, the North China sika deer (C. n. mandarinus) is believed to be extinct in the wild since the 1930s; the Shanxi sika deer (C. n. grassianus) has not been seen in the wild since the 1980s and is also believed to be extinct in the wild. The status of Manchurian sika deer in China is unclear, though it is also believed to be extinct, and the sightings there are actually feral populations.

The South China sika deer (C. n. kopschi) and Sichuan sika deer (C. n. sichuanicus) are the only subspecies known to remain in the wild in China. The former exists in fragmented populations of around 300 in southeast China, while the latter is found in a single population of over 400. The feral population is likely to be much higher than the wild, though most of them are descended from domesticated sikas of mixed subspecies. All of the subspecies are present in captivity, but a lack of suitable habitats and government efforts prevent their reintroduction.

The Formosan sika deer (C. n. taioanus) has been extinct in the wild for almost two decades before individuals from zoos were introduced to Kenting National Park; the population now numbers 200. Reintroduction programs are also under way in Vietnam, where the Vietnamese sika deer (C. n. pseudaxis) is extinct or nearly so.

Russia has a relatively large and stable population of 8,500–9,000 individuals of the Manchurian subspecies,[1] but this is limited to a small area in Primorsky Krai. Small populations might exist in North Korea, but the political situation makes investigation impossible. The species is extinct in South Korea, with no plans for reintroduction.

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  Outside of a store on the island of Miyajima
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  Tame deer wandering the streets of the town of Miyajima, Japan

Tsukioka Yoshitoshi ukiyo-e depicting the Minamoto no Tsunemoto hunting a sika with a yumi

Across its original range and in many areas to which it has been introduced, the sika is regarded as a particularly prized and elusive sportsman's quarry. In Britain, Ireland, and mainland Europe, sika display very different survival strategies and escape tactics from the indigenous deer. They have a marked tendency to use concealment in circumstances when red deer, for example, would flee, and have been seen to squat and lie belly-flat when danger threatens.

In the British Isles, sika are widely regarded as a serious threat to new and established woodlands, and public and private forestry bodies adopt policies of rigorous year-round culling.[21]

The main predators of sika deer include tigers, wolves,[11] leopards, and brown bears. Lynx and golden eagles target fawns.

Velvet antler (dried immature antlers) is a popular ingredient in traditional Chinese medicine, and sika in China were domesticated long ago for the antler trade, along with several other species. In Taiwan, both Formosan sika deer and Formosan sambar deer (Cervus unicolor swinhoei) have been farmed for velvet antlers. Japan is the only country in eastern Asia where sika deer were not farmed for velvet antlers.

Other deer raised for the antler trade were Thorold's deer (Cervus albirostris), central Asian red deer (Cervus canadensis affinis), and American elk (Cervus canadensis canadensis).

In Shinto, the Shika Deer is considered a kind of messenger between mortals and the kami.

• Deer of Great Britain
• Nara Park

• "Cervus nippon". Integrated Taxonomic Information System. Retrieved 10 February 2006.
• Igota, H., Sakagura, M., Uno, H., Kaji, K., Maneko, M., Akamatsu, R., & Maekawa (in press). "Seasonal patterns of female sika deer in eastern Hokkaidō, Japan." Ecological Research, 19.

• O'Brien, D.J., Rooney, S.M. and Hayden, T.J. (September 2009). "A differential vulnerability to hunting between the sexes in Sika-type calves". I. Nat. J. 30: 7–9. JSTOR 20764516.

Wikimedia Commons has media related to Cervus nippon (Sika Deer).

Wikispecies has information related to Cervus nippon.

• Nara's Sika Deer, from The Official Nara Travel Guide
• Hunting Sika in New Zealand
• Sika Deer Hunting
• Sika Deer in New Zealand and their distribution.