In biology, gregarious behaviour (from Latin gregarius "belonging to the herd") refers to the aggregation of otherwise separately living organisms at a place due to factors like the availability of food and water. In botany, it specifically refers to plants growing in open clusters or colonies. Sometimes it refers to the general concept of "living in a group", opposite to a solitary way of life. The related term Gregarism refers to the grade of aggregation of a species in specific parts of their environment. The related term gregarious parasitism refers to multiple individuals of a parasitic species living together in the same host organism, as opposed to solitary parasitism with only a single individual parasite per host.
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