Toxic species are organisms that produce harmful substances, which can be detrimental to other living beings. These toxins can be found in various forms, such as chemicals, proteins, or even physical structures. Examples of toxic species include certain plants like poison ivy, animals like pufferfish, and microorganisms like bacteria that can cause illness or death when ingested or touched. The toxins serve different purposes, such as deterring predators or competing with other species for resources. Understanding toxic species is important for both ecological balance and human health, as exposure to these organisms can lead to serious consequences.