What is a Rat?
Rats are long-tailed rodents. You can find the species of rats throughout the order Rodentia and specifically rats are found in the genus Rattus. Other rat genera included in the order Rodentia are Neotoma (packrats), Bandicoot (bandicoot rats), and Dipodomys (kangaroo rats). Rats are differentiated with mice depending on their size. Generally, people also call rats as mice if the size of the rat is small. Rat term is used indiscriminately to several rodent families, who have a longer body than 12mm or five-inch. Scientifically, the term ‘Rat’ can be applied to any of 56 thin tailed, medium-sized rodents in the genus Rattus.
Rats originate from Norway rats. They were found in the streets of cities in the field of rural areas. Norway rats were domesticated during victoria times and people started to breed them for attractive fur and colour. Rats are associated with humans for a long time not always for good reason. In the world, some of them consider the rat as a bad sign and some consider it as a god such as in India.
Classification of Rat
The scientific classification of rat is as follows -
Kingdom - Animalia
Phylum - Chordata
Class - Mammalia
Order - Rodentia
Genus - Rattus norvegicus ( Brown rat), Oryzomys palustris ( Marsh rice rat), Neotoma cinerea (Wood rat), Rattus rattus( Black rat).
After going through the above classification of rats, It would be very easy to answer the questions like what is the scientific name of rat? The scientific name of rat is Rattus and on further classification, the scientific name for the black rat is Rattus rattus and the scientific name od black rat is Rattus rattus.
Types of Rats
Now let us see different types of rats given below -
Norway rat is also known as Brown rat and they are 40cm in length with a tail shorter than the head and body.
They weigh around 350 - 500 grams and have a blunt nose, small ears, and a thicker body when compared to the Black rat.
The gestation period of brown rats is about three weeks and it takes ten to twelve weeks from birth to sexual maturity.
Brown rats are usually ground living and burrowing but sometimes they even climb.
Their preferred food is cereals and they eat around 30 grams of food a day and drink 60 ml of water
Ship rats are also known as the black rat or roof rat and their length ranges from 16 to 24 cm, with a tail longer than head and body.
They weigh around 150 - 200 grams. They have pointed noses, large ears and slender bodies when compared to brown rats.
The gestation period of black rats is about three weeks and they take 12 - 16 weeks from birth to maturity.
They often climb, agile, and rarely burrow.
Their preferred food is moist food and they eat around 15 gram of food per day and drink 15ml.
Woodrats are also known as pack rats and they are found in rodent genus Neotoma.
Packrats weigh around 250 - 600 grams. Packrats are relatively large because they occupy a large geographical area and its body size is correlated with the climate.
The length of wood rats ranges from 27 to 47 cm.
Packrat lives in any place from low, hot, dry deserts to cold and rocky slopes in timber lines by building their nest.
Packrats are nest builders; they usually use plant materials like branches, twigs, sticks and other available debris to build their nest.
Woodrats are known to transmit Arenaviruses which are transmitted through the air where faeces and urine are present and also Hantavirus( airborne) that can be fatal. Some of the other diseases are trichinosis, Bubonic plague, Typhoid and Weil’s disease. Packrats can also carry different bacteria like salmonella and parasites.
Marsh Rice Rats
Marsh rice rats look somewhat common like black and brown rats.
The total length of marsh rice rat is 22 to 30 cm and body mass is 40 to 80 grams.
It is the primary host of the Bayou virus and the most common agent of Hantavirus.
Rats are generally slender with pointed heads, large eyes, prominent thinly furred ears and they have moderately long legs and sharp claws. Brown rats have a larger body compared to the house rat and its tail is shorter compared to the body and they have thicker fur and 12 pairs of mammae instead of 10 pairs.
Male rats are usually larger than females. Pet rats are of different colours and patterns because of specialized breeding. The common colour variation rats having are brown, black, tan, grey, and white with both dark and lighter shades. Some of the most exotic colours seen in the rats are Siamese, blue, silver, black, silver faun, lilac, cinnamon, black-eyed white, cinnamon pearl, lynx, silver agouti, silver lilac, and blaze. Rat born with no tail is known as tailless rats and the rat born with no fur is known as hairless rats. The lifespan of rats is from 1.5 years to three years.
Uses of Rats
Rat is used as food meat in some cultures
Rats are also used as working animals. Some of the popular tasks include snipping of gun powder residue, demining, acting, and also for animal-assisted therapy.
It is used for odour detection as it has a keen sense of smell and they can be trained easily. These characteristics of rats have been used by Belgian non-governmental organization APOPO. The trained rats are used to detect the land mines and tuberculosis in the patients.
Rats have been kept as pets since the 19th century. Generally, brown rats are used as pet rats but sometimes black rats and giant pouched rats are also used as pets. Pet rats behave differently compared to the wild rats depending on the generation from which they are domesticated. Usually, pet rats do not have any health issues rather than pet cats and dogs.
Rats are also used for experimental purposes as they are proved to be valuable in physiological studies of learning and other mental processes. As well as they also help to understand group behaviour and overcrowding, a study in 2007 found that rats possess metacognition. Which is a mental ability previously only found in humans and some primates
Natural History of Rats
Rats are primarily nocturnal in nature (active at night) but in exceptional cases, brown rats are active in day as well as night both in rural and urban environments. All the rats are terrestrial and some of them are arboreal (Living on trees). Sulwesian rat is an excellent climber and they exhibit the combination of arboreal traits in the genus Rattus. Most of the rats can swim and species having thick and woolly fur can generally swim well. The brown rats have the terrestrial rat characteristics and morphology and a comparatively poor climber. But they have dense fur and readily enter the lakes and streams to hunt for fish, invertebrates or some other food. House rats are agile in nature, having the ability to climb and run on a narrow branch and electrical wire.
There is a misconception about rat species that they eat everything, But the diet of rats differ depending on the species and their habitat. House rats consume anything which is digestible and especially stored grains. Brown rats are basically omnivorous but they prefer a carnivorous diet. Depending on a wide variety of prey including shrimp, snails, mussels, insects, bird eggs and young, amphibians, eels, fish, pheasant, Pigeon, poultry, rabbits, and carrion. Many rat species living in the rainforest-like Sulawesian white rats and Hoffman’s rats eat only fruit and seeds of the fruit. Some rats from Philippine forest rat also eat insects and worms and other species of rats like rice-field rat (R. argentiventer) and Malayan field rat (R. tiomanicus) primarily they consume invertebrates found in the habitats of the forest, palm plantation and rice fields.
Reproduction of rats is studied using the brown rats. Rats reach their sexual maturity at three months and can produce 2 - 22 young per year. They reproduce more in spring and autumn climates and their gestation period is from 21 to 26 days. Breeding in rats occurs throughout the year in some species but in other species, it might be restricted to wet season or summer months.
Rats Free Places
There are no places on the earth without rats. They are found everywhere where humans inhabit. Antarctica is the only rat-free continent in the world because it is too cold for rats to survive outdoors. Rats are being introduced to all the surrounding islands of Antarctica because of their destructive nature. Some of the measures are taken to eradicate them. In particular birds island where breeding seabirds could be badly affected if rats were introduced.
The Canadian province of Alberta is notably the largest inhabited area on earth which is free from true rats. This is because of aggressive government rat control policies.
Rats love to chew due to the fact that their teeth never stop growing, which makes them become too long. Hence it makes them impossible to eat so they keep on chewing to make some wear down their teeth. Rats are famous for chewing things like soft concrete, wood, plastics, aluminium and cinder blocks.