It is not dangerous to groundskeepers. It is an attractive animal, and its venom does negligible harm to humans. Some people keep them as pets. The garter snake is often ground up in the blades of lawnmowers, or run over by children on bicycles. This can be inconvenient for property owners, but they rarely lose any sleep over the proximity of a garter snake. You can also routinely find this snake dead, in the middle of roadways. They share a fondness for the shenanigans of suicide squirrels. When frightened, a garter snake releases a strong musk from its cloaca. This musk has a fearsome stink, but that's probably the only thing scary about a garter snake. Raptors, corvids, crayfish, raccoons and other snakes feed upon garter snakes. Baby garter snakes are a snack for shrews and frogs. Very few groundskeepers have nightmares about garter snakes.
This is a copperhead:
It also known as the death adder. It is not a garter snake. It is not as commonly found in yards and lawns, or upon golf courses and roadways, as the garter snake. Perhaps it is a more intelligent serpent. Copperheads are extraordinarily talented camouflage artists, and prefer the woodlands and forested hills of North America. They have been known to climb trees, in order to hunt. Unlike garter snakes, who prefer to take shelter in lawn mowers, copperheads are ophidian ambush experts. When approached, they "freeze," or become very, very still. Remember, they are exemplary practitioners of camouflage. Sometimes stupid hunters, and other people who do not belong in un-Enclosed woodscapes, discover to their woe and chagrin that copperheads are right under their feet. And that they will, when cornered and threatened, bite. Unlike garter snakes, a copperhead's bite can cause discomfort. And pain. It is a fact that stepping upon a copperhead is bad for one's health.
This is a cottonmouth:
As with the copperhead, the cottonmouth is a pit viper. It is also known as a water moccasin, or a water adder. Cottonmouths are quite at home in swamps, riparian zones and watersheds, streams, lakes and ponds. The cottonmouth, who will even foray out to sea, is a world renowned swimmer. The cottonmouth is also not a garter snake. When threatened it will stand it's ground and show its fangs. From thence, comes its most common name. For, in showing its fangs, it flashes the milky white interior of its mouth. Can you picture it? You're a groundskeeper and you're just walking along, swinging your cattle prod, enjoying the autumn air, and you encounter a cottonmouth, head held high, fangs exposed, white mouth gleaming, standing its ground. You might even reconsider your career choices, if you were a smart groundskeeper. Because, the cottonmouth delivers a nasty bite. It can be very painful. And when left untreated, fatal. A person intruding upon the cottonmouth's natural habitat should be careful not to threaten this wonderful creature. For example, land developers and golf course designers might take some precautions when traveling in cottonmouth country. Or, they could bugger off entirely and instead try their hands at selling country club shares in the antarctic.
This is a timber rattler:
It's taxonomical name is Crotalus horridus. Garter snakes are occasionally heard complaining about timber rattlers. Rumor has it that the timber rattler has developed a taste for the garter snake. Poor, poor garter snakes. They should cower beneath tool sheds, where they feel safe. The timber rattler, like its viper cousins, the copperhead and the cottonmouth, is wise enough to pack venom when it goes on its travels. The timber rattler may in fact be the most dangerous snake in all of North America. It has very long fangs. And a "high venom yield." The timber rattler has such a "fearsome reputation" that past revolutionaries turned it into a symbol of their willingness to fight:
It's not that the timber rattler is an aggressive animal. It's not, really. You just shouldn't try to make it obey. The timber rattler is not a pet.
This public service announcement brought to you by the letter S.