Just like many other tick species, this tick is known to spread diseases. With these guys, you need to worry about Lyme disease. They are mostly found in forests in North America, so watch out for them.
Fortunately, their preferred host is, of course, deer, which is just one reason why you should just pet random deer. You are not a Disney princess. They are also known to feed on small rodents, so don’t go around petting those either.
Fleas
Usually more of an irritation than a source of death, flea bites can sometimes become infected, in which case they can be deadly. You mostly need to worry about the diseases they carry with them. As external parasites of mammals and birds, they live by consuming the blood of their hosts using mouthparts fitted for penetrating the skin and sucking blood.
They don’t have wings, but they have hind legs adapted for jumping, which allow them to jump a crazy distance 50 times their body length. They are one of the best-known jumpers out of the entire animal kingdom, relative to their body size.
Cone Snail
Also known as the “cigarette snail,” this little thing can kill 20 people with one drop of its venom. A sting by this animal leaves you just enough time to smoke one cigarette before dying. They are usually found in warm and tropical seas and oceans.
People are often attracted to their color and may want to pick them up. However, their sting will occur at random and is capable of penetrating the skin, gloves, or wetsuits. Plus, there is no antivenom, so it is best that you avoid this lethal critter.
Army Ants
Just look at those ferocious snappers. Thinking of an army of those is enough to send anyone running for the hills. For such a tiny insect, their bites are anything but small.
One bite can affect your circulatory system, and they’ll eat just about anything. An army ant colony never stops moving over the time it exists. Are they about to take over the world? Who knows? Are we about to stay close and find out? Heck no!
Moray Eel
Hanging out mainly in tropical seas, a moray eel doesn't really have much of a body count (an average of zero human deaths per year), but that doesn't mean they aren't dangerous. Their sharp teeth are perfect for puncturing through skin, and their thick, scaleless skin is difficult to penetrate in turn.
When disturbed, they're all too willing to take the fight to whatever is bothering them. If a human does manage to win the fight, they can't even enjoy the spoils of the battle – moray eel flesh can be toxic, causing illness or even death if it isn't prepared properly. If you're swimming in the warm waters of the Atlantic, Pacific, or Indian Oceans, watch out.