Intravenous Injection of Chemotherapy. It is very common for chemotherapy medications to be injected into a vein, or intravenously. In many cases, a nurse or doctor will insert a needle into your vein, often in your hand or arm, and the chemotherapy will be given through there.
2. Poison Dart Frog. Of all the poisonous animals in the world, these are probably the easiest to spot due to their extremely bright colors, including yellow, blue, green, & red. These frogs don't actually inject their poison through their mouth; they do it through their skin.
Australia's dangerous animals: the top 30. 1  Australia is home to some of the most dangerous animals in the world. But the deadliest will surprise you. 2  Australia's most dangerous animals. 3  The worldâs most venomous snake.