The Asian Small-Clawed Otter is the world's smallest otter species, reaching only 2 feet and 12 pounds. You can find one in Southeast Asia, from India's mangroves to Indonesia's rice fields, where they feed on crustaceans, mollusks, and small fish. 

To distinguish Asian Small-Clawed Otters from the others, their cheeks, chin, throat, and sides of the neck are whitish, transitioning to dark fur at the back and light brown at the underside.

The African Clawless Otter that lives in sub-Saharan Africa is also known as the Cape Clawless Otter or Groot Otter. As the third largest mustelid, it can be  5.3 feet long and 79 pounds heavy. Unlike its relatives, it has claw-less paws except for the three digits on its hind feet.

Moreover, African Clawless Otters can survive in various habitats, from semi-arid regions to dense forests, as long as a body of water is nearby. Their diet primarily consists of crustaceans, especially crabs, but they also eat amphibians, small mammals, and birds.

You’ve heard of computer bugs and viruses, yet there is an insect that loves your electronics enough to crawl inside and ruin them. The crazy ant can ruin your laptop or tablet in no time. When a scout finds a computer, it climbs inside and is killed by the electricity. When it dies it releases an alarm pheromone and soon you have the entire colony trying to kill your electronics.

Bomb? As in Boom? The Bombardier beetle’s backside contains two separate chemicals. If you or a predator gets to close, the Bombardier beetle releases the chemicals and once they mix a boiling party begins. The corrosive material comes out at temperatures hot enough to burn your skin.

If you are backpacking in Southern Europe, you might run into this surprising insect. Vampire moths love drinking the blood of vertebrates, and guess what you are a vertebrate. Equipped with a long needle-like mouth, it can easy penetrate your skin and get its fill.

You read that right. There is a tiny wasp that bears the name, Aha ha. The name was created by entomologist Arnold Menke. In 1977 he received the insect in the mail from a colleague, when the package was opened he exclaimed, “Aha!” The name stuck.

It bites. If you come across a really big beetle around your favorite fishing spot. It might be best to leave it alone. If you are wondering how big this bug can be, some toe-bitters can get to be the size of your IPhone. If you mess with one, watch out. Their bites are considered to be one of the most painful you can experience.

The name is disgusting, and so is the critter. The Tongue-eating louse is not an insect; it is a crustacean with a love for tongues, fish tongues. It eats the tongue of fish and then becomes the new tongue. Imagine having a crustacean as your tongue and you may begin to understand what a fish goes through.

The Hellbender is the largest aquatic salamander in North America. This species has adapted to the fast-flowing rocky rivers and streams in the Eastern United States, which it navigates easily due to its unique body shape. Its flattened body can reach up to 29 inches long. 

The Hellbender hides under rocks during the day and comes out to hunt for food at night. Its diet mainly consists of crayfish, but can also eat small fish, insects, and other salamanders. 

Moreover, its blotchy brown skin provides excellent camouflage against the riverbed. It is covered in a slimy mucus that acts as a respiratory organ, allowing the salamander to absorb oxygen directly from the water.

The Chinese Giant Salamander is the world's largest amphibian, found in the streams and lakes of China. It can stretch up to almost 6 feet in length, second only to the largest amphibian which is discussed in the next section. 

They are active at night and feed on insects, frogs, crabs, and fish. Sometimes, they resort to cannibalism. Since they have poor eyesight, they have a built-in vibrational sensor called the lateral line system that helps them locate prey and avoid danger. 

Interestingly, they make sounds resembling a baby crying, so locals in China call them "baby fish.” Despite this endearing name and their huge size, Chinese Giant Salamanders have the IUCN Critically Endangered status due to habitat destruction and overhunting7.