Hacker News Reader

That's an interesting point.

In the (UK) context of this study/article, blue tits and great tits (and indeed most garden birds) are generally non-migratory in the UK, so I think that's an orthogonal issue.

View on HN

To be fair bird movements are quite complicated: e.g. a Robin in the UK between September to March might be a member of a migratory or a non-migratory population. And Blackcaps are an example of a mostly migratory species in the UK but where less migratory individuals come to feeding stations in winter months.

Reply on news.ycombinator.com