Snakes and leeches inhabit the Cajun swamps, along with many other animals and insects that have adapted to life in this harsh environment. Some of the most common snakes found in the wetlands include cottonmouths, copperheads, and various species of water snakes. Sponges are also present in the swamp waters, and while they may be unsightly, they are not usually dangerous to humans.

Leeches are small, worm-like creatures that live in freshwater environments such as lakes, ponds, and rivers. They attach themselves to other animals, including humans, using their sharp jaws to pierce the skin and feed on blood. Once attached, they inject an anticoagulant into the wound to prevent the blood from clotting, allowing them to provide for extended periods.

Historically, leeches were used in medicine as a form of bloodletting, where they were thought to help alleviate various ailments by removing "bad blood" from the body. However, this practice has largely been replaced by modern medicine, and leeches are now primarily used in microsurgery, where they can help promote blood flow and aid in the reattachment of severed body parts.

One common myth about leeches is that they will continue to feed on a host until fully engorged and not detach until they have had their fill. In reality, leeches will typically detach once they have had enough to eat or if they are disturbed or feel threatened. Another myth is that sponges are always dangerous or carry diseases. While they can transmit infections if they have previously fed on an infected host, the risk to humans is generally low.