Caterpillars
While these count as larval stage of moths and butterflies, since you can tame them as hunter pets and they are never going to metamorphise into anything else, I'm going to give them their own section.
Caterpillars represent the larval stage of thousands of species and their color variation almost matches that of their adult stages. Since a lot of animals feed off of caterpillars, many have developed defense mechanisms to ward off predators. Some have hairy spines that deliver a toxin when touched. Others are brightly colored as a warning that they are poisonous to eat (some are, some aren't and are just cheating the system.) If a moth can be a hunter pet, then a caterpillar can be as well. They are considered "silkworms" as hunter pets and grouped with Worms. Not sure I agree with that. Completely different phyla. 
Caterpillar - spiderman (Frank) - flickrcc
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Caterpillar Papilio polyxenes asterius Stoll Black swallowtail butterfly - plaskota - flickrcc
Caterpillar (close up) - Green Putty In My Armpit - flickrcc
Saddleback Caterpillar Moth - Acharia stimulea - Hickatee - flickrcc
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Grasshoppers
There are about 11,000 species of grasshoppers and about 900 species of crickets. Grasshoppers are more active during the day where as crickets are more active at night. Both can produce sounds and "chirp" by rubbing their legs against their wings or abdomen. Since grasshoppers tend to have shorter antennae and crickets longer, the ones in game seem to more resemble crickets.
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Crickets
Cricket - casch52 - flickrcc
green bush cricket 2 - LHG Creative Photography - flickrcc
Duck-billed Killer King Cricket - teejaybee - flickrcc
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Grasshoppers
Grasshopper 8-16-2009 - JimWienecke - flickrcc
grasshopper - mondays child - flickrcc
grasshopper - teejaybee - flickrcc
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Water Striders
These guys are real insects that use water's high surface tension to literally "walk" on the water. There are about 1700 species and they live mostly in freshwater, preferring still ponds to moving streams or rivers. The environments where you find them in-game are just wonderful for them. Their movement over the water is perfect and I quite enjoy the inspiration Blizzard took from their wild counterparts. I really like that they are mounts, so unique, and of course I'm always happy when they give us more hunter pets. 
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Water Strider - Marko_k - flickrcc
Water strider- TommyHAGA - flickrcc
silver eyes - Thomas Binek - flickrcc - This is a close-up of a water strider's eye.
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And then there's this guy...
This questline in the Valley of the Four Winds was a neat progression of meeting the people and building the skills to then punch this guy from the inside, after Miss Fanny hits you as hard as she can to get you into the belly of the giant bug.
Ik'thik Colossus
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Praying Mantis - OC Always - Flikrcc
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