S4 E1 • Hissy Fits

If you have an anger-management problem, just wait 'till you see the worst temper tantrums in the natural world! We're counting down the top 10 most extreme hissy fits in the animal kingdom and seeing just who is most likely to fly off the handle. Male lemurs show off their anger by throwing stink bombs at each other but llamas prefer to spit out their frustration. Discover that when some animals get mad, they really see red when hissy fits are taken to the Most Extreme.

S4 E2 • Living Dead

You may think that zombies only exsist in horror films, but there really are animals that return from the dead. They may look dead but they really are alive. Find out who's the best as we count down the top 10 examples of the living dead. While some animals sleep through winter, the best hibernators can sleep for well over a century! Discover how easy it is for some animals to return from the grave when zombies are taken to the Most Extreme.

S4 E3 • Divers

With us being poor divers, we need special equiptment to dive to the ocean's depths. But some air-breathing animals can dive deeper than a submarine and hold their breath underwater much longer than a human can. But who is the most extreme diver? Find out in this top 10 countdown of the best divers in nature. There's a seal that can hold it's breath for 90 minutes underwater and a spider that dives to the depths using an air bubble! Discover what it really takes to venture 20,000 leauges under the sea when diving is taken to the Most Extreme.

S4 E4 • Dieters

If you feel that you need to loose weight, get some tips from nature's most extreme dieters. Find out who can last the longest without eating as we count down the top 10 most extreme dieters. From one animal that can eat 16 meals a day and never gains an ounce to another that can last 18 years between meals, discover that you can make a cake and eat it two when dieting is taken to the Most Extreme.

S4 E5 • Loudmouths

If you think your neighbors are noisy, just imagine what it's like for the neighbors of the loudest creatures on the planet. But who makes the most noise? Find out in this top 10 countdown of the loudest animals on Earth. From an insect that has to have built-in earphones to prevent it from going deaf by it's own noise, to a fish that's louder than a jet at take off, prepare to pump up the volume when loudmouths are taken to the Most Extreme.

S4 E6 • Fashion Disasters

S4 E7 • Appendages

Mirror, mirror on the wall, who's got the strangest body parts of all? Animals of course! But which one has the weirdest body of all? Find out in this top 10 countdown of the weirdest appendages in the animal world. From a 10 ft. nose to a bump that was once a living animal, discover that beauty really is in the eye of the beholder when appendages are taken to the Most Extreme.

S4 E8 • City Slickers

Humans have always built cities for social uses. But some wild animals call the urban jungle home, but which one has learned the most tricks to survive in an urban enviroment? Find out in this top 10 countdown. From thieving monkeys to a penguin that lives under houses in New Zealand, discover how hicks from sticks learn tricks when city slickers are taken to the Most Extreme.

S4 E9 • Transformers

While not all kisses can turn a frog into a handsome prince, there are animals that go through more miraculous changes. But which one goes through the most change? Find out in this top 10 countdown of the best transformers. From an octopus that changes size, shaoe, color and texture to an animal that turns itself into a vegetable by eating it's own brain, discover that the best transformers are those animals with the most bodies when transformation is taken to the Most Extreme.

S4 E10 • Workaholics

Do you think you work too much? Well, kick back and relax because your work habits are nothing compared to the top 10 most extreme workaholics in the natural world. There are animals that work 24 hours a day, 7 days a week, and 365 days a year! Discover that's it's all work and no play when workaholics are taken to the Most Extreme!

S4 E11 • Slime Balls

We as humans think slime is both gross and useless. But some animals need slime to do various tasks such as moving and protection. But which animal has the most uses for slime? Find out in this top 10 countdown. From a bird that uses spit to make a nest to a snail that uses slime as a road, discover how some creatures get themselves into a sticky situation when slime is taken to the Most Extreme.

S4 E12 • Animal Myths

Do you think that camels really do store water in their humps? Or that crocodile tears are for real? Or that bats are blind? You'll be really suprised as we count down the top 10 animal myths to find the most bogus "popular fact." Discover that you really can teach an old dog new tricks when myths are taken to the Most Extreme.

S4 E13 • Gourmets

If you think you're a kitchen whiz, just wait 'till you try the tastiest treats served by the best cooks of the natural world. The Most Extreme countdown presents the 10 animals whose food preparation is the most complex, ranging from squirrels that make maple syrup to crocodiles that blend their food. Guess who's coming to dinner when gourmets are taken to the most extreme.

S4 E14 • Diggers

Grab a shovel, because we're digging in to see some animals with real underground cities. But who has the most complex subterranean home? Find out in this top 10 countdown. From a bird that creates a hole for its home by flying head first into a cliff to an insect whose excavating can be heard a mile off, discover that there's more to digging than a hole in the ground when digging is taken to the Most Extreme.

S4 E15 • Weird Weapons

Humans are horrifically good at building weapons. But animals have weapons too, and not just jaws and claws. But who has the weirdest weapon? Find out in this top 10 countdown, from a lizard that shoots blood out of it's eyes to an acid-spitting spider. We're coming out with all guns blazing when weapons are taken to the Most Extreme.

S4 E16 • Cleaners

If you think you're a neat-freak, wait till you see how some animals keep up with their hygiene. As we count down the top 10 most extreme cleaners, we'll see we're nothing compared with these grime fighters. From sloths that let algae grow in their fur to a shrimp that will clean ANYTHING it sees, you'll be swept off your feet when cleaning is taken to the Most Extreme!

S4 E17 • Pirates

Pirates are people who raid, plunder, steal and hunt for treasure. Believe it or not, some animals are pirates as well! But who's the Most Extreme pirate? You'll do more than shiver your timbers when piracy is taken to the Most Extreme!

S4 E18 • Gardeners

If you think you can grow some big veggies, wait till you see just how the best gardeners in the natural world handle their plants! From a wasp that burrows inside a fig tree to pollinate the fruit to an animal that alters the SHAPE of trees in Africa, we're counting down the top 10 most extreme horticulturists in the animal kingdom to see how our green thumbs compete. Prepare to weed it and weep when gardening is taken to the Most Extreme!

S4 E19 • Freeloaders

If you think humans are the only animals that are lazy, just wait till you see the biggest freeloaders in the natural world. We're counting down the top 10 most extreme layabouts of the animal kingdom as we search to find the laziest creature on earth. From a fox that follows a bear for an easy meal to an unwanted guest in a moth's ear, discover that all kinds of animals can hitch a ride when freeloaders are taken to the Most Extreme.

S4 E20 • Awesome Ancestors

Everyone has a family tree, but just wait till you see some of the awesome ancestors of some animals! But which ancestor is bigger than its descendant? Find out when family trees are taken to the Most Extreme.