The first number is the number of males of the species, the second is females, the third is unknowns.

e.g. someone with:

Rana clamitans 2.0.1
Hyla versicolor 1.2.523

Has 2 male R. clamitans, and one of an unknown sex. They also have 1 male H. versicolor, 2 female H. versicolor, and 523 H. versicolor ​of an unknown sex (probably because they left a Barry Manilow record on).