Figure 4 in The Origin and Evolution of the Rattlesnake Rattle: Misdirection, Clarification, Theory, and Progress

Figure 4. Species of rattlesnakes that hunt by caudal luring. a) Newborn Ridgenose Rattlesnakes (Crotalus willardi) with their putative mother, from Arizona. Note that the tail is off-white. See paper by Schuett et al. (1984). Photo by Brendan O'Connor. b) A newborn Rock Rattlesnake (Crotalus lepidus), from Arizona. Note the bright yellow tail. See paper by Kauffeld (1943). Photo by Martin J. Feldner.