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Message: <blockquote data-quote="bombycilla" data-source="post: 1601338" data-attributes="member: 72567">Probaby a 5D. It has a EcD (type), though different from Parrot and a Fc that has not been found in Britain so would possibly be assigned a new number. Fc2 is already shared between Parrot and 'Wandering' Common types.To be fair Ron Summers described only the calls he found in Britain, following a similar system as those used by Groth in the US. Presumably, he didn't assume that a Fc would be exclusive to one Ec type ( which it isn't eg. 'parakeet' is a 1B ), so both are categorized.It is confusing, the 'Dutch' and 'British' systems. The problems of sonograms is that the 'classification' of their features can be just as troublesome as morphology, and it is possible to 'split' and 'split' to ludicrous extremes !</blockquote>