Exhibitions at London Zoo and Plymouth's Living Coast are showing off an enthralling series of ultra close up images of plankton taken by Dr Richard Kirby of the University of Plymouth.

Plankton are of course the tiny living organisms, some invisible to the human eye, that fill the seas and often form the bottom of the food chain. The Wikipedia article on plankton notes that 'plankton' is something of a catch-all term for tiny drifting sea organisms, which includes animals, plants and bacteria.

The BBC has an article and a narrated slideshow about the exhibition.