The Castor Semi-Looper, Achaea janata, is a Noctuid moth, the caterpillars of which are termed 'semi-loopers' due to their mode of locomotion. They feed on Excoecaria cochinchinensis (Euphorbiaceae),  Castor Ricinus communis and both Brassica and Ficus species. As they feed off the Castor Oil plant exclusively they are extremely poisonous and should be avoided at all costs.
The caterpillars are black in colour with white head and have a red knob on a tail. In the last stages the body turns brown or bluish-grey and the tail becomes black as well with the belly and the legs becoming orange.
- Leong, T. M., 2010. Final instar caterpillar and metamorphosis of Achaea janata (Linnaeus, 1758) in Singapore (Lepidoptera: Erebidae: Erebinae). Nature in Singapore, 3: 297–30
- Ronald F.L. Mau and Jayma L. Martin Kessing. "Achaea janata (Linnaeus)". Honolulu, Hawaii: Department of Entomology. Retrieved December 24, 2013.
- "Achaea janata". Butterfly House. Retrieved December 24, 2013.
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