According to the RSPB, trichomonosis, an avian disease caused by a parasite called Trichomonas gallinae, has reduced the UK’s chaffinch population by 34% in the last decade.
Audio: Common Chaffinch by Krzysztof Deoniziak (CC BY-NC-ND 4.0 DEED) xeno-canto.org XC884915
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Southwick Country Park Nature Reserve 