Gerbils are fast for their size, they travel at speeds of 8-11 mph and sprint at 17 mph maximum, they're predicted to be the fastest of the tiny rodents. But they're not as fast as their cosins the guinea pig and the rat which are 30 mph + . Sources: Rodent Velocity Expert
No they are very active and fast critters
It makes a warning noise to alert other gerbils in the colony that 'something' might not be right. It puts the other gerbils on alert too, to be aware of potential danger.
no they wont they will start to become lazy and tired fast
Most are not. Some people don't like small, fast, rodent-type animals.
i havent heard they can but my gerbil wiffy's head was shaking for a while one time so maybe they can have headaches
Other gerbils.
Gerbils are an animal and can not be "invented".
Male gerbils can be neutered, but it is not recomended. Female gerbils should not be spayed. In general male gerbils should not be neutered unless there is a good reason for it.
no gerbils are not originally from the UK but instead from the deserts of Asia. But you can still buy gerbils in the UK
Yes, mice are smaller than gerbils, but I think gerbils are the right size.
They do have seizures (this is common in young gerbils)
No, Gerbils are vegetarian.