Grasshopper

A large grasshopper such as a locust can jump about twenty body lengths without using its wings; the acceleration peaks at about 20g. Grasshoppers jump by extending their large back legs and pushing against the substrate (the ground, a twig, a blade of grass or whatever else they are standing on); the reaction force propels them into the air. They jump for several reasons; to escape from a predator, to launch themselves for flight, or simply to move from place to place. For the escape jump in particular there is strong selective pressure to maximize take-off velocity, since this determines the range. This means that the legs must thrust against the ground with both high force and a high velocity of movement. However, a fundamental property of muscle is that it cannot contract with both high force and high velocity, which seems like a problem. Grasshoppers overcome this apparent contradiction by using a catapult mechanism to amplify the mechanical power ] produced by their muscles.

02-08-2016

Image | This entry was posted in Wilden Marsh Nature Reserve. Bookmark the permalink.

7 Responses to Grasshopper

  1. Vicki says:

    Another superb macro………

    Liked by 1 person

  2. That is such a closeup, amazing picture of a beautiful insect.
    Your photography is amazing Mike!

    Liked by 1 person

  3. What an interesting creature. Wonderful photograph of it.

    Liked by 1 person

  4. Pingback: Grasshopper’s: The Ultimate Defender | ZOO*3700's Blog

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