I honestly wouldn't get them unless you are reeeeeeaaaaaaallllllllllllllyyyyyy expierienced(sp)
They are very tiney, and it is hard to tell which sex they are, and usually by the time you figure it out, there will be pregnant mice.
When they're younger they are about the size of the tip of your finger.
Please don't get these unless you know a lot about exotics!!
They are very cute though!

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My Animals!!
6 Fish : Mr. Fish, Ariel, Nemo, Swimmy, Sassy, & Twitch
3 Dogs : Jacoby, Scruffy, & Spanky
2 Hamsters : Gustifur & Brownie
2 Parakeets : Billy & Mandy
1 Mouse : Pinky
1 Cat : Lola
(:
RIP Banana & Marilyn