phylum- chordata.
class-mammlia.
1.Most wide spread rodents.
2.snout is elongated.
3.Incisors are long sharp chisel like and slightly curved. incisors re rootless one pair in each jaw.
4.Body is black or grey coverd with small soth hairs.
5.tail is long without hairs.
6.Adapred for various modes of lige viz arboresl terrestrial and undergrpund.
7.Rats are a great menace to mankind They are carriers of deveral disease germs viz cholera typhus rat bite fever plague jaundice tuberculosis of poulatry and trichinosis of swine.there are many type of rats viz shiop rat sewer rat house
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