The article also includes some background on mouse vocalizations, including the observation that "pups produce [ultrasonic] 'isolation calls' when cold or when removed from the nest". This, of course, makes these guys seem even cuter:
10-day-old baby mice, hopefully not vocalizing that they're cold or lonely.
They've even got a table of the most common mouse syllables; maybe Semantic Compositions can help me learn to speak mouse-ish.
Holy TE, Guo Z. 2005. Ultrasonic Songs of Male Mice. PLoS Biol 3(12): e386 (full-text; synopsis; press-release)