"Dangerous species" refers to animals or plants that can pose a threat to humans, other animals, or the environment. This can include predators like great white sharks and grizzly bears, which can attack if they feel threatened. Some species, like poison dart frogs and box jellyfish, have toxins that can be harmful or even fatal to humans upon contact. Invasive species, such as the Burmese python in the Florida Everglades, can disrupt local ecosystems by outcompeting native species for resources. Additionally, certain plants, like giant hogweed, can cause severe skin burns. Understanding these species is crucial for safety and environmental conservation.