Being bitten by a venomous species of snake doesn't always mean you've recieved any venom. An estimated 30-40% of all venomous snake bites are "dry bites" and release little to no toxin at all.
All venomous snake bites should be treated as a medical emergency in most cases the faster you get to a hospital and get anti-venom the higher your chances of survival. In the case of a Rattlesnake bite minutes count, if you recieve the anti-venom within 2 hours of receiving the bite you have around a 99% chance of surviving the encounter.
Despite being feared by many large snakes such as the Python have resulted in only around 10 deaths in the US since 1990.
When handling large constrictors such as a Python it's always a good idea to have a second person on hand just in case. Never underestimate the power of these amazing animals as they are basically one giant muscle.
All of the dangerous venomous snakes in the U.S come from two families Elapidae (Coral Snakes) and Viperidae (Copperheads, Cottommouths/Moccasins, Rattlesnakes) making identification somewhat simple. All venomous native species in Viperidae share an arrowhead shaped head notably larger than the neck, heat sensing pits, and slanted or non round eyes. All native members of Elapidae in the U.S. share a distinct pattern of red bordering yellow/white stripes while non-venomous mimics have a pattern of red bordering black stripes.
This is true only of U.S. members of Elapidae, color patterns change on the Coral Snakes found in other countries.
Snakes do not experience "Hibernation" instead they experience brumation. During brumation snakes remain awake and do not feed off of their fat stores like mammals do. Their metabolism is temperature controlled and thus slows allowing them to remain awake yet sluggish while not requiring the consumption of food.
Feeding a snake that is in brumation is never a good idea as due to the drop in metabolism the food will often rot inside it's stomach and may cause death. Snakes will often forgo eating in the fall to prepare for brumation.
Snakes don't have ears they hear most likely by vibrations in the ground.