Abstract
Using an improved form of swab and selective cultural conditions Aspergillus fumigatus Fresenius was found in 86 of 1188 Pink-footed Geese ( Anser brachyrhynchus Baillon), in four of 61 Canada Geese ( Branta c. canadensis L.) and 13 of 102 Herring Gulls ( Larus a. argentatus L.) caught in Britain. The Pink-footed Geese, migrating from Iceland, appear to become infected shortly after arrival. In the Solway, a higher level of infection was found than elsewhere. The fungus was shown to be present in the natural habitats of these birds and it is suggested that infection usually occurs from a heavy but local growth of the fungus in a micro-habitat associated with the birds' food.

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