Rub there back firmly, If she stands still with her tail up she is, They come into heat generally every 4 days so keep at it.
None...
i don't know if i get your question but i think that is urine.
Only a vet that has evaluated and weighed it can know for sure, otherwise your hamster can get an overdose.
only MALE HAMSTERS LICK FEMALE HAMSTERS SCENTS "I KNOW THAT BECAUSE I HAVE A MALE HAMSTER & A FEMALE HAMSTER".
Because he wanted to know how far his hamster Burt ran every day.
anytime baby
It depends on the hamster, so i dont know.
What is a hamster that has no legs called? A furball.
you get it
Ask yourself one key question: "Do I want a hamster?" If the answer is yes, then any hamster will do.
a hamster doesnt know how to swim this is all i know soz
you will have to ask the person who sold you the hamster that is the only way.
If you see the hamster looking and nibbling for a place to get out, then they want to get out. I found this answer because my own hamster escaped. 
If he bites you.
hamster tumors are just the same as a humans. When you start to feel small or large bumps on a hamster you will know that its a sign and you should immediately take your hamster to the vet, and they will see what they can do, or if your hamster is in pain, they can put your hamster to sleep humanely.
If it is a female, she could be going into season.
A Russian hamster is small,quite fat and fluffy. A Chinese hamster is the sallestt, thin with quite big eyes. a syrian hamster is big with fur.