well that's really up to you. Hamsters do have a habbit of chewing them though so once it gets chewed to peices and can no longer be used.
You atleast need to change he/she's water one time each week. Hamsters are desert animals. But some hamsters might need lots of water
Only if it is leaking there. They do sometimes, but not that often. If you have taken the tank off for some reason, you should probably go ahead and change it.
If you do not change the bedding often then your hamster could get fleas.
I think gerbils will more often because they are more curious than hamsters.
How often should you change the fuel filter?
No they can't. Although often they might chew them up and seem like they are eating them, they are really just storing it in their cheek pouches to use later to make a bedding.
The replacement of a toilet brush will depend on how often they are used. In general they should be replaced at least every six months but in some cases if used a lot they should be replaced sooner.
as often as needed
No, hamsters are actually pretty territorial. They often fight with mates.
You should change your oil every 3,000 miles. If you drive your car rough, then you should change it more often.
YES . my syrian loves them. except i' m not sure dwarfs or robos should have strawberries.
everyday
Yes two female hamster can fight but not as violent or often as male hamsters. female hamsters can get in rarely any fights