Season 1Edit

Number Original airdate Title Overview Animal that was Number-one Image
1 July 7, 2002 Speed The fastest animals on land, air and water. Tiger Beetle
2 July 14, 2002 Birth Extreme reproduction in number of young, size and other factors. Tapeworm
3 July 21, 2002 Cheats The ways animals trick one another. Cuckoo
4 July 28, 2002 Survivors The animals who best survive extreme conditions. Water Bear
5 August 4, 2002 Jumpers The fastest, highest and best jumpers. Flea
6 August 11, 2002 Gluttons The greediest eaters in the world. Caterpillar
7 August 18, 2002 Builders The animal kingdom's most innovative construction engineers. Termite
8 August 25, 2002 Fighters Warriors of the animal kingdom. Ant
9 September 8, 2002 Horrors The animals that most inspire terror in human beings. Parasitic Worm
10 October 27, 2002 Strength Proportionally, the strongest animals in the world. Rhinoceros Beetle
11 November 3, 2002 Biters The deadliest, most prolific and most extreme bites. Cookie-Cutter Shark
12 November 10, 2002 Smarts Geniuses in the animal kingdom. African Grey Parrot
13 November 17, 2002 Lovers Most extreme courtship rituals. Spider

Season 2Edit

Number Original airdate Title Overview Animal that was Number-one Image
14 May 11, 2002 Moms Mothers with the heaviest, hardest or most unusual jobs on the planet. Sea Louse
15 June 15, 2003 Dads Fathers in the wild can go to extremes to take care of their young. Seahorse
16 June 22, 2003 Venom Animals with the most lethal venomous bites or stings. Jellyfish
17 June 29, 2003 Disguise These animals are experts at pretending to be what they're not. Mimic Octopus
18 July 13, 2003 Swarms Hordes in the animal kingdom including millions and even billions of individuals. Argentine Ant
19 September 7, 2003 Body Parts Animals with relativelty large body parts. Giraffe
20 September 14, 2003 Predators The most efficient hunters come in many sizes. Shrew
21 September 21, 2003 Stinkers The worst smelling animals, including one with stench that kills. Skunk
22 September 28, 2003 Super Senses The world's best at keeping up with their environments. Shark
23 November 23, 2003 Eaters Animals with the most unusual menus. Vulture
24 November 30, 2003 Daredevils Top stunstmen of the natural kingdom. Barnacle Goose
25 December 7, 2003 Defenders The best and most unusual self-protectors. Bee
26 December 21, 2003 Oddities Strange animals and their human equivalents. Deep-sea anglerfish

Season 3Edit

Number Original airdate Title Overview Animal that was Number-one
27 3 August 2004 Gross Outs The most disgusting behavior in the wild Fly
28 10 August 2004 Home Designers The most extreme, unusual and innovative animal architects. Termite
29 7 September 2004 Tough Babies The strongest babies in the animal kingdom with human comparisons. Sand Tiger Shark
30 14 September 2004 Wild Partiers How the most extreme partiers in the wild compare to human get-togethers. Red Crab
31 21 September 2004 Monster Myths The reality behind some of the most feared animals in the world Wolf
32 12 October 20004 Killer Cats The most ferocious felines in the world House cat
33 19 October 2004 Battle of the Sexes Males and females of some species have very little in common with each other, and they aren't always good for each others health Whiptail Lizard
34 23 November 2004 Big Mouths Proportionately, the largest mouths in the world Argentine Wide-Mouthed Frog
35 30 November 2004 Deadly Snakes The most venomous, dangerous and prolific killer snakes. Cobra
36 14 December 2004 Killers The animals with the highest human kill counts. Mosquito
37 8 February 2005 Bloodsuckers Vampires in the animal kingdom. Tick
38 15 February 2005 Super Sharks The "highest tech" sharks in the world Hammerhead Shark
39 22 February 2005 Poison The deadliest chemical defenses. Poison Dart Frog
40 1 March 2005 Super Dogs The 10 dog breeds that evolved farthest from the wolf. Chihuahua
41 8 March 2005 Global Conquerors The most invasive animal species. Cockroach
42 15 March 2005 Outrageous Flirts The unusual ways that animals attract one another. Elephant
43 27 April 2005 Athletes The most athletic animals, and their human equivalents. Arctic Tern
44 4 May 2005 Odd Couples When two kinds unite: unexpected animal partnerships. Greenland Shark / Ommatokotia
45 25 May 2005 Movers The animals that move the best, with the least limbs for movement. Scallop
46 1 June 2005 Troublemakers The animals that causes the most trouble for humans, just doing what they do. Termite
Season 4
Number Original airdate Title Overview Animal that was Number-one
47 25 October 2005 Hissy Fits The worst temper tantrums in the animal world Elephant
48 1 November 2005 Living Dead Not actual zombies, these animals which are playing dead or dormant can appear back from the dead Water Bear
49 8 November 2005 Divers The animals that can hold their breaths the longest or dive relative depths Whale
50 29 November 2005 Dieters Some animals can eat a lot without gaining wait, while other animals can go a long time between meals Tick
51 24 January 2006 Loudmouths The world's loudest animals Pistol Shrimp
52 2 February 2006 Appendages The most unusual animal attachments Anglerfish
53 7 March 2006 Transformers 10 transformers capable of altering themselves in extreme ways Ribeirio
54 14 March 2006 Fashion Disasters Animals whose appearances can put them in danger Deer
55 21 March 2006 City Slickers Animals best adapted to life in human urban enviorments Macaque
56 28 March 2006 Workaholics The hardest working animals in the natural world Honey Bee
57 25 April 2006 Slime Balls The animals that have found the most or most innovative ways to use their slime Banana Slug
58 2 May 2006 Animal Myths The most misunderstood animals Lemming
59 6 June 2006 Gourmets Animals put time and effort into their food preperation Honey Bee
60 13 June 2006 Diggers Most extreme cavity makers Termite
61 20 June 2006 Weird Weapons The strangest ways animals defend themselves or attack Electric Eel
62 26 September 2006 Cleaners Nature's most unusual neat freaks Japanese Macaque
63 3 October 2006 Pirates Animals who act like pirates, taking from others or hunting for treasure Amazon Ant
64 10 October 2006 Gardeners The unusual ways that animals impact vegetable growth Lemon Ant
65 17 October 2006 Freeloaders Opportunistic animals that gain benefits by associating with others Tapeworm
66 24 October 2006 Awesome Ancestors Prehistoric animals larger than their modern descendants/relatives Megatherium
Season 5
Number Original airdate Title Overview Animal that was Number-one
67 24 April 2007 Inventors Innovative tools nature-built into an animals body Wood Frog
68 1 May 2007 Night Lights The brightest animals in the wild Anglerfish
69 8 May 2007 Leaders Animals with extreme number of followers Termite
70 15 May 2007 Medics The unusual ways some animals self treat Axolotl
71 22 May 2007 Freaky Flyers Animals with unusual ways of moving through the air Spider
72 5 June 2007 Bodysnatchers Animals that take over the bodies of others Toxoplasma
73 12 June 2007 Gadgets The animals which create/use the most tools Chimpanzee
74 19 June 2007 Psychics Animals that seem to predict the future Ladybug
75 26 June 2007 Dirty Jobs The "jobs" of animals that are most revolting Dung Beetle
76 3 July 2007 Crazy Collectors The most hoarders in the wild Pack Rat