1. Snake Venom: Produced by various snake species, snake venom can contain a mix of neurotoxins, hemotoxins, and cytotoxins. Examples include the venom of the cobra, rattlesnake, and viper. 2. Spider Venom: Notable examples include the venom of the black widow spider and the brown recluse spider. These venoms can cause severe pain and systemic symptoms. 3. Scorpion Venom: Scorpion stings can be highly painful and, in some cases, life-threatening. The deathstalker scorpion is one of the most dangerous species. 4. Marine Toxins: Marine animals like the box jellyfish and the blue-ringed octopus produce potent toxins that can cause rapid, severe reactions.