The north/south divide

After mentioning my Blackbird nest at the weekend, I spotted this great results page from the BTO's NestBox Challenge yesterday. The red markers show Blackbird nests; those with eggs are in blue and those with chicks in white.


I would have expected more of a north/south divide, but this is more obvious in something like Blue Tit (below), with southern birds more advanced than northern ones, especially in the sunny southeast...


The maps are still a bit sparse in parts, so if you've got any nesting birds in your garden (not just Blackbirds and Blue Tits) then do join the free survey at www.bto.org/nbc