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This is a bug that I observe in Melbourne.

This bug is living in wet places and jumping a few centimeters while its length is 8.5mm.

It does not have insect legs. It's legs are more similar to prawn.

Sorry my camera cannot capture a better picture as the bug is too small.

enter image description here enter image description here

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This is a "sand hopper" (Talitridae), also known as "land hoppers" or "sand fleas". The Talitridae are a cosmopolitan family of arthropods, known for their hopping behaviour when disturbed.

Which of the genera it is from would be impossible to determine without detailed close-up pictures and a bit of expert knowledge which is well outside my expertise.

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It is "Lawn Shrimp", an Australian indigenous creature. It is harmless.

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    $\begingroup$ Hello ar, welcome to Biology. This answer is very brief and adds little beyond what another answer has already stated except an additional nickname of the species and a great (but redundant) picture. Please refer to our help center for guidance on how to answer questions. Enjoy the site. $\endgroup$ Oct 31, 2021 at 4:31
  • $\begingroup$ @ARogueAnt., I wonder why you call this answer redundant when the previous answer does not specify the type of the creature. It only refers to the family of it. I see no "lawn shrimp" in the answer above. $\endgroup$
    – ar2015
    Nov 1, 2021 at 15:39
  • $\begingroup$ Whilst the picture you've supplied appears to belong to the same family as the other answer, lawn shrimp usually refers to Arcitalitrus sylvaticus which is quite a bit smaller than the size specified in the question (and a different colour, but that may not matter). --Unless I've misread or misunderstood the descriptions. $\endgroup$ Nov 1, 2021 at 15:48
  • $\begingroup$ @ARogueAnt., I have no better photo. I removed it. $\endgroup$
    – ar2015
    Nov 1, 2021 at 15:50

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