They are live born and a record of their lifespan can be 19 years.
With forward facing eyes, their vision is more binocular than that of most snakes. This gives them excellent aim and the ability to precisely judge distances when striking. They also can "smell" by collecting molecules on their forked tongues, then transferring them to a special receptor on the roof of their mouth called the Jacobson's Organ.
They like to hunt birds & their eggs, mammals, reptiles and amphibians.
Rattlesnakes are also able to sense vibrations through the ground created by the movement of other animals. Even a small mouse tip-toeing through soft sand does not go undetected by a rattlesnake. The rattlesnake's most unusual method of detection is its' "infrared night vision." Special organs called Loreal Pits on the snake's face allow it to detect the slightest change in temperature. This allows it to locate and precisely strike the warm body of a living mouse that mistakenly thought it was concealed by total darkness. After delivering the venomous bite, the snake swallows the rodent victim whole.