Pest Library

Rodents

    
ROOF RAT (Rattus Rattus)

Also called the black rat. The black rat is a common long-tailed rodent. It is again largely confined to warm areas. Despite its name it comes in several color forms. Compared to the Brown Rat, it is a poor swimmer, but more agile and a better climber, tending even to flee upwards. It is usually black to light brown in color with a lighter underside. A typical rat will be 20 cm long with a further 20 cm of tail. It is nocturnal and omnivorous, with a preference for grains. In a suitable environment it will breed throughout the year, with a female producing three to six litters of up to twenty young. Females may regulate their production of offspring during times when food is scarce, throwing as few as only one litter a year. Roof rat lives for about 2-3 years. Social groups of up to sixty can be formed.

NORWAY RAT (Rattus Norvegicus)

Also called the brown rat, house rat.The Norway rat is found generally at lower elevations but may be found wherever humans live. The tail is scaly, semi-naked and shorter than the head and body combined.They burrow to make nests under buildings, beneath concrete slabs, in garbage dumps, and at other locations where suitable food, water, and shelter are present.

These Rats have poor eyesight, are colorblind and very sensitive to motion.

Female Norway rats may come into heat every 4 or 5 days.

Litters of 6 to 12 young are born 21 to 23 days after conception and they grow rapidly. They can eat solid food at 2 1/2 to 3 weeks. They become completely independent at about 3 to 4 weeks and reach reproductive maturity at 3 months of age, sometimes as early as 8 weeks.

HOUSE MOUSE (Mus Musculus)

The house mouse is a small, slender nocturnal rodent that has a slightly pointed nose; small, black, somewhat protruding eyes; large, scantily haired ears, and a nearly hairless tail with obvious scale rings. They are colorblind. They are generally grayish-brown with a gray or buff belly. The house mouse often lives in close association with humans. They are not hesitant to sample new foods and are considered "nibblers," sampling many kinds of items that may exist in their environment. Foods high in fat, protein, or sugar may be preferred some ex. are bacon, chocolate candies, butter and nutmeats. They can get by with little or no water. They obtain their water needs from the food they eat.

Litters of 5 or 6 young are born 19 to 21 days after mating, although females that conceive while still nursing may have a slightly longer gestation period. Newborn mice grow rapidly. They begin to make short excursions from the nest and eat solid food at 3 weeks. Weaning soon follows, and mice are sexually mature as early as 6 to 10 weeks old.