Anaerobic bacteria do not require oxygen to live. They can generate energy through fermentation or anaerobic respiration, which do not require oxygen as a final electron acceptor. Anaerobic bacteria are found in a wide variety of habitats, including soil, water, and the human body. Some common examples of anaerobic bacteria include *Clostridium botulinum* (which causes botulism), *Escherichia coli* (which can cause food poisoning), and *Staphylococcus aureus* (which can cause skin infections).