This is the caterpillar form of the white-marked tussock moth. This little creature is indeed special as he is most known due to the colors and features he has. The little hairs you can see throughout will actually cause a breakout on your skin if you touch them! Those little "sack" looking things on its back? Thats actually clusters of hairs that, when touched, will come off and stick onto your skin! It may be able to defend itself, but it sure looks cool while it does so.