I see some decimal numbers before the listing of snakes, and in the case of one of the forum members, other animals. Would someone be so kind as to explain their meaning?

Example (from Steveo):
0.1 Puget Sound, 1.2 red Plains, 1.1 Easterns (from ery/flame x mel or snow) 0.1 desert/cali King, 1.1 Sinaloan milks 0.1 cat, 0.1 dog 0.1 human