BTO
@_BTO
The British Trust for Ornithology (BTO) is the UK's leading charity working with volunteers to improve our knowledge of birds through monitoring and research.
14-04-2009 10:22:17
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With practice, and close views, adult Kingfishers can be sexed on the basis of bill colour. Adult males have at least 2/3 of their lower bill black, while in adult females at least 2/3 of the lower bill is orange. Can you sex this bird BBC Springwatch? #Winterwatch
