monophagous

/məˈnɑfəɡəs/
adjective
  1. Feeding on only one kind of food, especially a single plant species.
    • The koala is monophagous, eating almost exclusively eucalyptus leaves.
    • A monophagous diet can be risky if the food source becomes scarce.
    • Many insect larvae are monophagous, relying on a single host plant for survival.
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