Well this will sound crazy but it is us humans. We can have the longest hair in the animal kingdom. I believe the longest is 18 ft 5.54 inches. I believe the second longest hair in the animal kingdom would probably be a horse. There tail can be very long.
http://www.guinnessworldrecords.com/records/human_body/extreme_bodies/longest_hair.aspx
the one in your pants
humans
tortoise has lived the longest
ok the animal that has lived the longest was the deer
The longest animal in the world would be the bootlace worm (Lineus longissimus). A specimen was recorded at 180 feet long. The longest vertebrate in the world is the Blue Whale (longest recorded at 108ft).
The Aldabra Tortoise is the longest living animal ever! It can live for about 152 years!
They animal with the longest bone is the giraffe because of its really long legs
The sloth
The longest hair on the Yorkie with the longest hair was a dog named Etna with hair a foot and a half long and still holds the record for the Yorkie with the longest hair today
the longest hair was 5.627 cm
Perhaps Samson. See related link below:
what animal can stand the longest time
The longest person in the world that has the longest armpit hair was Iwokasha Ban from Iraq who had arm pit hair like an ungroomed.
neuron. A neuron such as one that runs from your foot to your neck is an example of the longest cell in animale life. These are the longest because they can run the length of the body, in humans, in animals neurons are also the longest.
Rapunzel is have the longest someones hair has ever been
tortoise has lived the longest
Kate longwell
The longest hair on a horse is its tail, but the longest mane in the world records was nine feet and ten inches.
It isn't known which animal was the longest as no animals are specifically named.