Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer).
Song birds discriminate between the songs of their conspecifics and those of closely related species from a young age. Now it is shown that song discrimination in two flycatchers has a strong genetic component as is not determined by social experience.
Why genetic variants that confer risk for psychiatric disorders persist in the genome is an evolutionary conundrum. Here, Mullins et al. report association of polygenic risk for autism with having fewer children and polygenic risk for ADHD with higher reproductive fitness.
Genomic analysis of Salmonella Enteritidis isolates taken from a single individual with a chronic and relapsing infection reveals how these bacteria have adapted to their host surroundings. Increased within-host fitness comes at the expense of ancillary traits such as virulence.