Northern quoll
- The northern quoll is the largest mammal with male semelparity: males die after mating.
- The northern quoll is the smallest species in the spotted quoll genus; males weigh no more than 900 g. Their body length is only 25–35 cm.
- Newborn northern quolls are only 3 mm long. They are born between late July and September, before reaching even 4 mm.
- Females give birth to more young than teats — only those that attach survive.
- Suffers from cane toad toxin, to which it has no resistance.
- Nocturnal, feeds on insects and small vertebrates.
- Uses dens in hollows and crevices.
- In captivity 3–5 years.
- Status Endangered.
Age
The northern quoll has a typical lifespan of from one year to one year and one month, with a maximum recorded lifespan of five years and eleven months; its theoretical lifespan ranges from three years to five years and eleven months. The species reaches sexual maturity between ten months and one week and one year. The young’s eyes open between two months and two weeks and three months, after a very short period of embryonic development within the mother. The young live in the mother's pouch, drink milk, and grow rapidly during a period of from two to four months. An individual enters the adult stage, which lasts from ten months to two years and nine months, at which point it can hunt independently and produce offspring.
Phenotype
The northern quoll has short, grey-brown fur with white spots on its back and sides, which aid in camouflage among rocks and leaves; strong claws on its paws assist in climbing rocks, digging shelters, and catching prey. The species possesses a long tail that helps maintain balance when jumping and climbing, and it has sharp teeth used for catching and tearing food. Adult northern quolls have white spots on their backs and sides.
Physiology
Northern quolls measure from 17.8 centimeters to 4.5 meters in height, and from 20 to 37 centimeters in body length; their mass ranges from 449 grams to 0.67 kilograms. The embryo stage has a body mass of 0 grams and a body length from 5 millimeters to 1 centimeter. During the juvenile stage, the young have a body mass from 0.1 to 50 grams and a body length from 1 to 10 centimeters. Adult northern quolls weigh from 0.5 to 1.2 kilograms and measure from 25 to 37 centimeters in body length.
Habitat
Northern quolls inhabit land at elevations up to 600 meters; the species occupies tropical dry forests characterized by heat and a dry season, as well as tropical savannas with heat, uneven rainfall, and abundant grasses and trees. The landscape includes terrestrial forests, grasslands, steppes, and herbaceous areas. The climate features little precipitation in winter and more in summer, with consistently hot temperatures throughout the year and frequent rains although sometimes dry conditions prevail. Large amounts of rain occur in summer, while almost no precipitation falls in winter; summers are pleasant, with temperatures ranging from 20 to 25 degrees Celsius.
Shelter
Northern quolls are found in rocky areas and forests, utilizing dens for reproduction, rest, and protection from the sun.
Geography
Northern quolls are found within the biogeographical region of Australasia, specifically inhabiting tropical savanna ecosystems including the Arnhem Land tropical savanna, the Carpentaria tropical savanna, and the Kimberley tropical savanna.
Feeding
The northern quoll is a predator that hunts insects, small mammals, birds, lizards, and frogs, and occasionally consumes fruit. The species employs active hunting and pursuit strategies, using hearing and sight during nighttime foraging. Its diet includes beetles, flies, moths, butterflies, water striders, ribbon worms, snails, nematodes, bedbugs, grasshoppers, dragonflies, and mayflies. The young consume milk. Daily food requirements range from 30 to 80 grams.
Reproduction
The small northern cat inhabits and develops on land, outside of water bodies, and reproduces through homogamy, always with fertilization and without changing generations. The female carries offspring in a pouch or in her mouth on land, subsequently giving birth to from 4 to 8 offspring; the embryo development takes 2 weeks 6 days. The offspring move into the mother's pouch and grow there on milk, and eggs, eggs, or offspring can develop in a terrestrial nest built on the ground or close to it, as well as in burrows in the soil, dug in the form of underground passages. Newborns, eggs, or larvae may be buried in the ground. The reproductive interval for the species is 1 year, and maturity occurs from 8 months to 1 year.