https://en.wikipedia.org/wiki/Willow_tit https://www.rspb.org.uk/birds-and-wildlife/willow-tit https://ebird.org/species/wiltit1 https://animalia.bio/willow-tit https://xeno-canto.org/species/Poecile-montanus https://www.wwt.org.uk/our-work/projects/willow-tit/ https://www.birdguides.com/news/results-from-national-willow-tit-survey-published/ https://www.rspb.org.uk/birds-and-wildlife/willow-tit