Observation reveals 29 black-backed and 17 red-billed gulls per mile along Otaki Beach, indicating important population metrics.
Eleven counts of black-backed and red-billed gulls were carried out in March, 1961, on a seven miles long beach between the Otaki and Ohau rivers. Juvenile black-backed gulls amounted to a quarter of the population and the overall density was estimated at 29 black-backed and 17 red-billed gulls per mile.
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Kazimierz Wodzicki (1962) studied this question.
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