Bird control and outdoor sculpture

I am posting this query on behalf of Carol Sussman, who will not see your
responses here.

    Does anyone have any suggestions or comments regarding bird
    control strategies in the immediate vicinity of outdoor
    sculpture?  In this specific situation, there is a large
    overhanging tree providing an attractive roost over a large
    sculpture.  Relocation is apparently not an acceptable option,
    nor is strategic branch trimming.  Spiked metal wire is expected
    to be ineffective and problematic.  Are there any successful and
    humane "high tech" options (eg. ultrasonic) etc.?

    Of course, birds are not the only problem with overhanging
    vegetation, and it is assumed that a frequent maintenance
    program for both the sculpture and the tree will be implemented.

    Carol Sussman
    620 W. Wilshire Ave.
    Fullerton, CA 92632
    714-870-7107

John Griswold
Wharton and Griswold Associates

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                  Conservation DistList Instance 8:89
                    Distributed: Sunday, May 7, 1995
                        Message Id: cdl-8-89-011
                                  ***