A worm table sounds fab!! you could have a large tray of soil/compost and pink worms to find - chunky wool, long balloons fastened with a small puff inside or use tied/cut pieces of pink foam sheets for play - risk assess to check suitablility, include some plant pots to collect the worms in. Make and laminate some numbered discs for them to find in the soil as well - pink and brown - 1 to 5 or 10 then a tank or farm if you have one, showing how real worms live within our soil, making it good for plants & flowers to grow in. Books for reference, photos & a visit to a composting bin/area and
Wiggly woo rhyme ..
Hope you have a great time with it, let us know what you do xx