Red Deer were introduced into New Zealand in 1851.
Red Deer live in herds of females, with young of both sexes, and a separate groups of stags. Their social system is strictly matriarchal.
Toward the end of September, the onset of new antler growth forces stags to cast their old antlers.
Calves are born in November or December, occasionally later, after a gestation period of about 8 months.
A week or two before the rutting season, the stag’s neck begins to swell, giving him an impressive appearance. The actual rut (or roar) starts about the first week in April, depending on climate.