Thamnophis sirtalis parietalis

Also known as Red-sided Gartersnake, Prairie Garter Snake

Red-sided garter snakes are famous for forming the largest communal hibernacula of any reptile, emerging by the tens of thousands from limestone crevices each spring. Their striking red or orange bars sandwiched between yellow longitudinal stripes make them easy to recognize across prairies, woodlands, and wetlands. Emerging females release potent pheromones, attracting dense mating balls of eager males before dispersing into summer foraging grounds.