PantherKut

Size and Weight:

The head and body length of an Ethiopian wolf is about 1 m (3.3′). Female Ethiopian wolves average 12.8 kg (11.2 – 14.2 kg) (average 28.2 lb (24.6 – 31.2 lb)); males average 16.2 kg (14.0 – 19.3 kg) (average 35.6 lb (30.8 – 42.5 lb)).

Habitat:

The Ethiopian wolf is confined to isolated pockets of alpine grasslands and heathlands above 3,000 m (10,000′) in Ethiopia, where they prey on rodents, such the giant mole rat (Tachyoryctes macrocephalus). Rodent biomass varies several-fold between different habitats, and the abundance of these prey is closely correlated with that of the wolves. Suitable habitats extend from above the tree-line at about 3,200 m (10,500′) up to 4,500 m (14,000′), with some wolves present in montane grasslands at 3,000 m (10,000′). However, subsistence agriculture extends up to 3,500 – 3,800 m (11,500′ – 12,500′) in many areas, restricting wolves to higher ranges. Wolves appear to utilize all available habitats, but they prefer open areas with short (less than 24 cm (10″) high) herbaceous and grassland communities where rodents are most abundant, along flat or gently sloping areas with deep soils and poor drainage in parts. Rainfall at high altitude varies between 1 – 2 m/year (3.3 – 6.6′/year), with one pronounced dry period from December to February/March.

The Ethiopian wolf lives in both the Eastern Afromontane Biodiversity Hotspot as well as in the Ethiopian Highlands Global 200 Ecoregion.

Age to Maturity:

Both sexes mature during their second year.

Gestation Period:

Approximately 60 days.

Birth Season:

In the Bale Mountains, mating generally occurs between August and November, with pups born 2 months later.

Birth Rate:

2 – 6 pups per litter.
Females breed no more than once a year. Only about 60% of dominant females breed successfully each year.
Generation time: mean: 4.5 years, range: 3 – 8 years

Early Development:

Development of the young is divisible into three stages: 1) early nesting (week 1 to week 4), when the young are entirely dependent on milk; 2) mixed nutritional dependency (week 5 to week 10), when milk is supplemented by solid foods regurgitated by all pack members until pups are completely weaned; and 3) post-weaning dependency (week 10 to 6 months), when the pups subsist almost entirely on solid foods supplied by helpers.

Dispersal:

Dispersal movements are tightly constrained by the scarcity of suitable unoccupied habitat. Males do not disperse; two-thirds of the females disperse at two years of age and become “floaters”, occupying narrow ranges between pack territories until a breeding vacancy becomes available. Breeding females typically are replaced after death by a resident daughter. This results in a high potential for inbreeding which may be circumvented via inter-pack mating.

Diet:

Analysis of fecal samples in one study revealed that rodents account for 96% of all prey (Sillero-Zubiri & Macdonald 1997). The endemic giant mole rat (Tachyoryctes macrocephalus) is the main food item. Other prey includes grass rats and hares. In the alpine meadows of Bale Mountain National Park, rodent biomass was estimated at 3 – 4000 kg/sq km (27 – 36 lb/acre)

Behavior:

Ethiopian wolves are diurnal; peaks of foraging activity suggest that they synchronize their activity with that of rodents above the ground. Digging prey out is common. Kills are often cached and later retrieved. Although the Ethiopian wolf is a pre-eminent rodent hunter on its own, it can also be a cooperative hunter. Occasionally, small packs have been seen chasing and killing young antelopes, lambs, and hares. Wolves congregate for social greetings and border patrols at dawn, noon and evenings, and rest together at night, in the open. They break up to forage individually in the morning and early afternoon. In Bale, there is little nocturnal activity, with wolves seldom moving far from their evening resting site. They may become more crepuscular and nocturnal where human interference is severe.

Pups are born in a den dug by the female in open ground, under a boulder or inside a rocky crevice. Pups are regularly shifted between dens, up to 1300 m (4300′) apart. Dens usually consist of a much-used system of burrows beneath a rock overhang or cliffs; other burrows located in a flat, grassy area have several entrances, possibly interconnected.

Social Organization:

Although Ethiopian wolves live in packs that share and defend an exclusive territory, for the most part they forage and feed alone on small rodent prey. This is in contrast to the general tendency in larger carnivores for species that live in groups to hunt cooperatively. In optimal habitat, packs include 3 – 13 adults and, on average, are comprised of 6 adults, 1 – 6 yearlings, and 1 – 7 pups. A typical pack is an extended family group formed by all males born into the pack during consecutive years and 1 – 2 females.

During the breeding season, social gatherings among different packs are more common and take place next to the den. The interactions are highly vocal and always end with the smaller group fleeing from the larger. Home range overlap and aggressive encounters between neighboring packs are highest during the mating season. Courtship may take place between adult members of a pack or with members of neighboring packs. Mate preference within a pack is shown, with the female discouraging attempts from all but the pack’s dominant male. In contrast, she is receptive to any visiting male from a neighboring pack. Up to 70% of matings involve males from outside the pack. All pack members guard the den, chase potential predators, and regurgitate or carry rodent prey to feed the pups. Subordinate females may assist the dominant female in suckling the pups

Age and Gender Distribution:

In optimal habitat, pack adult sex ratio was biased toward males by a ratio of 2.6:1. In an area of lower prey productivity, the adult sex ratio was 1:1.
Of all adult males in a population, 31% are alpha males and thus reproductive individuals. Some adult males who are subordinate at a particular time may be able to reproduce subsequently, either by replacing the alpha male or by mating outside of the pack. Of all adult females in a population, 57% are alpha females and thus reproduce. Of the subordinate adult females, some may be able to reproduce in their lifetime.

Density and Range:

The highest population density was perhaps 2 individuals/sq km (5.2 individuals/sq mi).

In the Bale Mountains, wolf density is high for a social carnivore of its size and is positively correlated with density of rodent prey and negatively with vegetation height. Highest wolf densities are found in short alpine herbaceous communities (1.0 – 1.2 adults/sq km (2.6 – 3.1 adults/sq mi)). Lower densities are found in dwarf scrub (0.2 adults/sq km (0.5 adults/sq mi)), and in heathlands and barren peaks (0.1 adults/sq km (0.3 adults/sq mi)). Wolves are also present at low density (0.1 –0.2/sq km (0.3 – 0.6 /sq mi)) in montane grasslands at lower altitudes. Elsewhere, overall wolf density is relatively lower. In Menz, wolf density was estimated at 0.2/sq km (0.6/sq mi).

Annual home ranges of eight packs in optimal habitat monitored for four years averaged 6.4 sq km (2.5 sq mi), and home ranges in an area of lower prey biomass averaged 13.4 sq km (5.2 sq mi), with some overlap between home ranges. An additional 4 – 7% of the population was composed of non-resident females, inhabiting larger ranges (average 11.1 sq km (4.3 sq mi)). Home ranges of neighboring packs were largely discrete, forming a mosaic of packs occupying all available habitat. Pack home ranges were stable in time, shifting only during major pack readjustment after the disappearance of a pack or significant demographic changes.