Undertail-coverts of Little Grebe

According to the literature, one important distinction between Pied-billed Grebe Podilymbus podiceps and Little Grebe Tachybaptus ruficollis is the white undertail-coverts and vent of the American species. In BWP, the undertail-coverts of Pied-billed are described as 'conspicuous white', but those of Little Grebe as 'grey-brown' in breeding plumage and 'pale grey-br

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