Unusual invasion of white herons from Australia noted in New Zealand, suggesting broader ecological impacts.
From April, 1957, unusually large numbers of white herons (Egretta alba) were seen in scattered areas of New Zealand from Northland to Southland. It appears that an extensive invasion from Australia occurred. This report summarises the records in the Wildlife files. Several other Australian breeding species appeared at the same time, and these are also discussed here.
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Ian G. Andrew (1963) studied this question.
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