The same technology that reveals to expectant parents the sex of their developing fetus is now being used for noninvasive, real-time imaging of small, live animals such as mice, rats, chick embryos, and zebrafish. Toronto-based VisualSonics'
http://www.visualsonics.com Vevo 770 imaging system uses micro-ultrasound to generate high-resolution (down to 30 micrometers) images, allowing researchers to study embryonic and neonatal cardiovascular and neurological development as well as tumor development.