Why are the legs of insects not always identical?

Why do stick insects have red legs?

• Answer:

  Not all stick insect species have red front legs. The Indian Stick Insect is very well known for its bright red found on the inside of its front legs. It is not clear why it is coloured in such a way, but there are some possible reasons: Red could distract a predator from eating it, as many animals will refrain from eating a bug with red colouring as this often means they are poisonous or don't taste nice. Many harmless creatures, like stick insects, use this tactic as well. Another possible theory is that the red is for communicating to other stick insects of the same species.