The numbers and decimal points indicate the number of snakes, and their gender. The number to the left of the decimal point indicates male, and the number to the right of the decimal point indicates female.
For example: 1.1 means 1 male, and 1 female.
0.1 means no males, and 1 female.
2.3 means 2 males, and 3 females.
4.0 means 4 males, and no females.
You may also see something like, 1.2.4 - the number to the right of the second decimal point means 'gender unknown'. So this would be 1 male, 2 females, and 4 animals of unknown gender.
I hope this helps!
Kathy