Tiger Rattlesnake
Crotalus tigris
Photo taken in Phoenix, Arizona at Piestewa Peak Park, August 24, 2003.
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This seems to be the most common rattlesnake in the Phoenix Mountain Preserve. The above specimen, which measured ca. 75 cm., was intently approaching a covey of quail that had a lot of small chicks. This snake is full grown and at the upper size range for tigers.
The loss of predators in urban parks such as the Phoenix Mountain Preserve can lead to highly imbalanced ecosystems. Without a good predator base herbivores like rabbits and rodents become super abundant. They exceed the carrying capacity of the habitat causing vegetation loss and local extinctions of their favorite food plants. High population densities of certain animals can then lead to massive die offs or outbreaks of diseases. Bottom line is that we need to preserve the predators in these parks as much as the open recreational space. Simple respect for these animals will prevent most unfortunate encounters. Do not harass or attempt to pick them up. Watch where you put your hands and feet. Keep pets on a leash. If you hear a rattle, stand still until the exact location is identified, then simply back away. These snakes have absolutely no interest in attacking humans. They just want to be left alone in the beautiful desert habitat they help maintain.
Viperidae -- Viper Family