Hey Michael. They're saying how many snakes, of what sex, a person has. The first number, in front of the period, stands for males. The second number stands for females. Some people will have a second decimal and third number, which stands for unknown sex.
Example:
1.0 = one male, zero females
0.1 = zero males, one female
1.1.1 = one male, one female, one unknown.
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