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    The cooperative breeding system of the Harris' Hawk in Arizona

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    Author
    Dawson, James William, 1957-
    Issue Date
    1988
    Keywords
    Harris's hawk -- Reproduction.
    Harris's hawk -- Behavior.
    Hawks -- Behavior -- Arizona -- Pinal County.
    Advisor
    Mannan, R. William
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    I studied the social organization of the Harris' Hawk (Parabuteo unicintus) in Arizona, 1984-1986. Breeding groups ranged in size from 2-7 and averaged 3.8 hawks. Offspring fledged during previous nesting attempts accounted for 72% of immature helpers. Aggregations averaged 5.9 hawks and were composed primarily of individuals from 2 or 3 neighboring groups. I identified 2 affiliative behaviors and 5 aggressive behaviors that Harris' Hawks used during social interactions. Behaviors that constituted overt aggression were rare in groups, but occurred in aggregations during interactions between hawks from different groups. Groups defended only their nesting areas during nonbreeding periods but defended foraging and nesting areas during breeding. Groups formed aggregations only during nonbreeding periods in specific areas between territories. I observed a peak in aggregation formation about 2.5 weeks before nesting. Open water was used frequently by nesting Harris' Hawks for drinking and bathing. Water sources were not defended and were shared by >1 group.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Renewable Natural Resources
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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