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  1. The struggle within the same species, i.e. similar kind of organisms is called intraspecific struggle for existence.
  2. In animals, when a large number of off-springs are produced and if they do not get sufficient accommodation, they struggle for life.
  3. It is the most difficult type of struggle due to common need for food, shelter, mate, etc.
  4. E.g. Between sheep’s for grass.