Another reason for the survival of the musk ox is the strong herd structure in the species. When a predator messed with one musk ox, it quickly found that it had to deal with the entire angry musk ox herd. Predators would focus on the smaller, weaker calves rather than adults. But in order to protect their calves, adults would form a protective ring around the youngsters, leaving their heavily armed heads to face the predators. Unfortunately, this makes the herd sitting ducks for human hunters, but the strategy does work against their non-human predators such as wolves and grizzly bears.
Both males (bulls) and females (cows) grow curving horns.
In late June, family herds of cows separate to form smaller harems for their favored bulls. Each bull services half a dozen cows during the rutting season. Bulls that are too young or too old to breed form their own herds in order to keep protected from predators. Bulls fight for cows through charging and slamming each other’s heads. At the beginning of winter, around November, the bulls let the cows go back to their larger family herds.
Cows have a gestation that can last up to nine months, but often only lasts eight months. Calves are born with eyes open and are able to stand within a few hours. However, if a calf is unable to keep up with the herd, this usually indicates that the calf is ill or injured. The mother then abandons the calf in order to save her own life. With luck, a musk ox can live for 20 years.
Picture of the musk ox by Dixi, licensed under GFDL
Which zoos have them?Minnesota Zoo (United States)
The Musk ox, muskox is listed as Least Concern (LR/lc), lowest risk. Does not qualify for a more at risk category. Widespread and abundant taxa are included in this category, on the IUCN Red List of Threatened Species
Namings for the muskoxA young / baby of a muskox is called a 'calf'. The females are called 'cow' and males 'bull'. A muskox group is called a 'yoke, team, drove, herd or nye'.
Some facts about the
Adult weight : 315 kg (693 lbs)
Maximum longevity : 27 years
Female maturity :1096 days
Male maturity : 1278 days
Gestation : 258 days
Weaning : 213 days
Litter size : 1
Litters per year : 1
Interval between litters : 608 days
Weight at birth : 11.46 kg (25.212 lbs)