Two Truths, One Lie

Which fascinating fact is actually a fib?

1. Timber rattlesnakes are Missouri’s largest venomous snake. Most adults are 3 to 5 feet long, but some may grow over 6 feet long.
2. Heat-sensing organs located between the nose and eye help timber rattlesnakes sense mice and other warm-blooded prey, even in total darkness.
3. A new section grows on a timber rattlesnake’s rattle each year. Biologists who are trained to handle venomous snakes count the sections to tell how old a snake is.