Common Mormon Caterpillar

Description:

1.5 inch, found in Pakistan, India, Bangladesh, Nepal, Sri Lanka, Maldives, Myanmar, Thailand, southern and western China (including Hainan and Guangdong provinces), Taiwan, Hong Kong, Japan (Ryukyu Islands), Vietnam, Laos, Cambodia, Andamans, Nicobars, eastern and Peninsular Malaysia, Brunei, Indonesia (except Moluccas and Irian Jaya), Philippines, and Northern Marianas (Saipan).

Habitat:

Found them usually eating on citrus leaves

Notes:

Some parts of their body mimics bird feces and they release these pair of long red horn called an "Osmeterium" which releases a foul order which smells like feces when threatened.