the santa catalina rattlesnake is a small and slender species of rattlesnake. it can grow up to the length of 73.1 centimeters (28.8 in), and is known for being one of the few rattlesnakes which don't have a rattle on the end of their tail. some santa catalina rattlesnakes are light cream in color with reddish-brown blotches down their back, while some are ash gray with dark gray blotches on them.