The islands are home to a nationally important population of breeding eider duck. In 1958 he visited the Arctic Circle to research eider duck. Common throughout Lindisfarne and the Farne Islands are the common eider duck. Ocean ducks include oldsquaw (long tailed duck), eider duck, and scoter. In Northumberland, the eider duck is known as the cuddy duck. The full coat of arms includes an eider duck as the crest.