Puffin BTO - British Trust for Ornithology

British Trust for Ornithology - Wikipedia

This major guide improves on the original, now comprehensively covering 155 species, with descriptions of ageing and sexing methods, moult, biometrics

Identification of European Non-Passerines - J.K. Baker

Where Have All Our Seabirds Gone?

Farne Islands to close due to impact of bird flu

Browse publications by type BTO - British Trust for Ornithology

COP26: Fears for UK puffin population due to warming seas

Articles, Page 100

Collins BTO Guide to British Birds by Paul Sterry, Paul Stancliffe (Hardcover, 2015) for sale online

Nature alert: nearly one-in-five bird species in Europe is at risk of extinction - Birding24/7