Great tits and the biology of behavior

I mostly just wanted to use that headline. This is an article about birds with different alleles of a gene affecting dopamine binding. In some populations of great tits, having a particular allele makes the birds more exploratory. In other populations, it doesn't.

In other words, the influence of genes and the environment on behavior is complicated. You already knew that, didn't you? One of the rules of life is that everything is more complicated than you think it is.