Arthropods

Tardigrade: Nature's Toughest Animal
Tardigrades, also known as water bears, are survivors. They can survive temperatures near absolute zero, as well above boiling. They can survive pressures six times greater than that at the bottom of the deepest ocean trenches, ionizing radiation, and the vacuum of space. They can survive without food or water for 10 years. They are amazing creatures

Wikipedia entry: http://en.wikipedia.org/wiki/Tardigrade

Mantis Shrimp: Super Crustacean
The mantis shrimp is a colorful, intelligent crustacean with unique characteristics. It has the most sophisticated visual system of any creature. Humans have three types of color receptors in their eyes; mantis shrimp have sixteen. They can see colors that are unimaginable to any other species. They can see polarized and ultraviolet light.

Mantis shrimp also has one of the fastest movements in the animal kingdom, when they strike with their claws.

Wikipedia entry: http://en.wikipedia.org/wiki/Mantis_shrimp

Zombie Fly
The zombie fly lays its eggs inside a bee. The larvae emerge and attack the bee's brain, causing it to abandon the hive, walk in circles, and generally act disoriented.

http://en.wikipedia.org/wiki/Apocephalus_borealis

Velvet worms
TODO

Horseshoe crab: Living Fossil
The horseshoe crab is considered to be a living fossil, largely unchanged over the past 420 million years.

It has five eyes and ten legs.

It has no hemoglobin in its blood.

Wikipedia entry: http://en.wikipedia.org/wiki/Horseshoe_crab

Tongue-eating Louse: As Gross As It Sounds
The tongue-eating louse affixes itself inside its host fish's mouth and replaces its tongue.

It uses this position to feed upon whatever the fish eats.

Wikipedia entry: http://en.wikipedia.org/wiki/Cymothoa_exigua