Hamster time

Yesterday we were gifted two female Hamsters with cages from one of the members of the Freecycle group I run (Glendale AZ Freecycle). The kids absolutely love them, especially Michelle, who had been asking me for a hamster for the longest time.

Can you spot the difference between the two?
The one to the left is a Chinese dwarf (longer tail) and the one to the right is a Siberian dwarf.