Eastern garter snake (Thamnophis sirtalis) – This is one of the most common snakes on Beaver Island and can be seen scurrying through open fields, near the forest edge, and close to water. They are quite adaptable to environmental changes and prefer moist habitats. Adult snakes range in size from 45-137 cm (18-54 in). This species is extremely variable in color, having a background color of brown or black with three stripes of yellow, greenish-yellow, blue or white. This striped pattern and color make it difficult for predators to follow garter snakes as they move in the grass. Garter snakes (like most reptiles) are active thermoregulators - they regulate their body temperature by moving towards sun if it is cold and shade if it is hot. They can be found basking in the open sun or seeking cover under logs, rocks and boards during the hottest part of the day. As anyone who has picked up a garter snake knows, they secrete a foul smelling musk to deter predators. Although no snake on Beaver Island is venomous, the saliva of garter snakes has been reported toxic to small animals.