Rodent Seranade

'News' from the USA that male mice will court females (especially when out of visual contact- these are not very visual animals being keener on smell) using high-frequency ultrasound  (http://www.theguardian.com/science/2015/apr/01/squeaky-serenade-male-mice-woo-females-with-song-scientists-discover). This is not especially remarkable as mice use ultrasound in both intermale conflict and, in the case of the pups, to encourage retrieval by their mothers when they stray from the nest. The use of courtship ultrasound is also well documented in laboratory rats. Although they are a separate species, they share many aspects of life-style!