Coal Tit breeding

Coal tit: song, nest & identification - Plantura

Coal tit: song, nest & identification - Plantura

Coal tit - Wikipedia

Diversity, Free Full-Text

Coal Tit – Pembrokeshire Avifauna

Coal Tit - Bird Factfile

Coal Tit - eBird

Coal Tit BTO - British Trust for Ornithology

Lifespan, lifetime reproductive performance and paternity loss of within-pair and extra-pair offspring in the coal tit Periparus ater