The best-known rat species are the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). This group, generally known as the Old World rats or true rats, originated in Asia . Rats are bigger than most Old World mice , which are their relatives, but seldom weigh over 500 grams ( 17 + 1 ⁄ 2 oz) in the wild.

2025年2月3日 · Rat, the term generally and indiscriminately applied to numerous members of several rodent families having bodies longer than about 12 cm, or 5 inches. (Smaller thin-tailed rodents are just as often indiscriminately referred to as mice.)

The rat is a medium-sized rodent. Rats are omnivores, they eat different types of food. Most rats are in the genus Rattus. There are about 56 different species of rats. The best known rats are the black rat (Rattus rattus), and the brown rat (Rattus norvegicus). These two are known as Old World rats. The group has its origins in Asia.

Of the dozens of species in the genus Rattus, the most familiar are those which commonly live among us: the brown rat (also known as the Norway rat or sewer rat) and the black rat (also called a...

2023年4月27日 · There are nearly 60 known rat species around the world. (Image credit: Getty) Rats are thin-tailed, medium-size rodents that originated in Asia and Australia but are now found all over the...

Everything you should know about the Rat. The Rat is a mid-size rodent, which is considered a common pest, though some species are kept as pets.

2024年8月12日 · Rat Facts . Signs of a rat's presence are droppings, gnawing marks, tracks, runways, and burrows. Like mice, rats are nocturnal and have very poor eyesight but have very strong senses of smell, taste, and hearing. Compared to mice, rats are much larger, have coarser fur, and have proportionately larger heads and feet.

Rats belong to the family Muridae and the genus Rattus, which includes well-known species like the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). With their strong teeth, sharp senses, and agile movements, they have evolved to thrive in a wide range of conditions.

2023年12月29日 · In North America the primary rat species of concern within the genus Rattus are the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). While many rodents are referred to as "rats" due to similarities in appearance and behavior, not all …

The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat.One of the largest muroids, it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. It weighs between 140 and 500 g (4.9 and 17.6 oz).