The vast majority of animal attacks will cause the types of injuries that you would expect to find. Creatures such as bears and sharks can cause serious damage with their claws or teeth, however there are some animals that are able to induce incredibly strange wounds with completely bizarre side effects.
These might range from toxins that can cause unusual psychological conditions, venom that is able to change the way that a person behaves or other effects that stop bodily functions from operating in their normal ways. While these attacks are very rare occurrences that will only affect a few people every year, they are all frighteningly real.
The Irukandji jellyfish is a species that is mainly found in Queensland, Australia, that can cause many of the same symptoms as other jellyfish if they sting a person. However, they also have some unique side effects that include severe headaches, abdominal pain, nausea, anxiety, hypertension and sweating. Most bizarre is a feeling of existential dread whereby victims feel a strong sense of impending doom and that they are certain to die even if they are not in very much pain. Symptoms usually go away after around 30 hours although if the sting is left untreated it can cause cardiac arrest.
Found commonly in sub-Saharan Africa, the Boomslang snake is a relatively shy species that will generally avoid human contact. If it does come across a person, though, and decides to attack, it can cause some pretty unique effects as the venom is hemotoxic. This essentially means that it destroys red blood cells and stops the clotting process in blood, causing the victim to bleed out of every orifice, including the eyes, ears, nose and gums. The process can take up to five days to complete before the victim eventually bleeds to death.