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Caterpillars on tree IMG_9514 | by fran.j
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Caterpillars on tree IMG_9514

I found these caterpillars on a Virgilia divaricata tree in Fernkloof Nature Reserve, Hermanus, South Africa. Each is about 6cm long and they are all sitting with their heads downwards. 5 days later they were still in the same position

What kind of caterpillar is it and what does the butterfly look like? Why do they behave like this?

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Taken on September 14, 2011