An organism that feeds on parts of, several or many hosts during its lifetime and causes some detrimental effects on the fitness of its hosts excluding immediate death (eg. insects+plants, vampire bats and biting flies, starfish and corals). 

Distinguishing features of grazers 

  • the interaction is a short period of time of the grazers lifespan
  • interaction does not generally result oin death of host

  • it may interact with many hosts during it's lifetime in a single feeding bout
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