| | News | Gainesville.com | The Gainesville Sun | Gainesville, Fla. (Site not responding. Last check: 2007-09-24) |
 | | They suggest that the crossbills might be included in the genus Carduelis, but given that the adaptations of the crossbills represent a unique evolutionary path, it seems more appropriate to split up the genus Carduelis as it was already done during most of the 20th century. |
 | | The species of crossbills are difficult to separate, and care is needed even with Two-barred/Hispaniolan Crossbill, the easiest. |
 | | The other species are identified by subtle differences in head shape and bill size, and are the subject of much taxonomic speculation, with some scientists suggesting that the previously held assumption that the Parrot and Scottish Crossbills and possibly the Hispaniolan and Two-barred Crossbill are conspecific. |
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