Blue Tits

Interesting to see the age ratio's of blue tits caught this week. I looked back at the data for the past four months from Mullock and Caldey with a few from Pwllchrochan :_

Adults Aug 4, Sept 8, Oct 1, Nov 3
Juvs (birds born in 2008) Aug 17, Sept 32, Oct 33, Nov 19

Interestingly our last catch a week ago also had a higher proportion of adults so perhaps the older birds are faring better this autumn. It will be interesting to see how the ratio's work out as the winter goes by. We can probably do this for a range of species once the data set is up to date.