"As the caterpillar grows it develops the skull pattern as a defence strategy to shock potential predators," conservation officer Mick Andren told Newsweek.
Next time you see a butterfly, treasure the memory: scientists raise alarm on these 26 species theconversation.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from theconversation.com Daily Mail and Mail on Sunday newspapers.