19 minutes

Sponges are one of the more colourful and abundant groups of animals, yet they are generally poorly known by students of biology. One reason for this is the difficulty of observing anatomy and behaviour in these animals - features that exist at the microscopic level, and processes that take place over extended periods of time. This program reveals many of the difficult conceptual aspects of sponge biology through microscopy, animation, and time-lapse microscope photography. (2005).