BTO Birdtrack, a resource

“BirdTrack is organised by the BTO for the BTO, RSPB, BirdWatch Ireland, SOC and WOS.” (British Trust for Ornithology, etc.) is an online resource reporting sightings of birds in the UK and Republic of Ireland.

Bird numbers vary for a variety of reasons, particularly seasonally, this resource gives access to the reports. Accuracy relies on the consistency of the many humans watching.