Once upon a time - a very long time ago - primary school children were entertained by those very educational before-frogs known as tadpoles.
In days of yore teachers would collect frog spawn from ponds and woodland puddles so that youngsters could watch as day-by-day - often in murky jam jars - the little black squiggly things emerged from the blobby spawn - grew legs - and became frogs - eventually turning from black to green. Wonderful.
Now Britain's common frog is no longer as common and removal of spawn from the place it was laid is frowned on.
Never fear: the charity Action for the River Kennet (ARK) have an even better idea.
The other day, children from Chilton Foliat Primary School put on their wellies and got into the River Kennet to release the young trout they have been caring for in their classroom. It is part of the Trout in School programme run by ARK.
Over the past few months the children have had a tank set up in their classroom and have watched their brown trout eggs hatch out and develop into little fish.
Along the way they've been learning about how precious and special chalk streams are both for humans and for the wildlife that depend on them.
ARK have run several fun sessions with the primary pupils - including one session showing them a selection of freshwater invertebrates so the children can learn to identify them and see what their trout will be eating when they are in the wild.
"The teacher and her class have done an amazing job, they have really embraced looking after the trout. The children now know lots about brown trout and their life cycle and why it is important to be water efficient and not pollute our rivers", said ARK Project Officer Anna Forbes.
ARK Trout in School is part of the charity's Water Matters project funded by Thames Water.