The Discovery Centre’s mud snails have had their first clean of 2014.
Education staff have tackled the mucky job of clearing out the water tank, which is home to dozens of tiny molluscs.
Presenter Pam Midwood, pictured right, said: “Mud snails typically live in old ponds and ditches throughout the UK with nutrient poor water so we only clean out the tank every few months.
“It’s quite a big job to do, taking a couple of hours because we have to be so careful that we haven’t scooped out any of the snails as they are so small and babies are very difficult to spot.”
Mud snails (lymnaea glabra) are currently listed as near threatened due to habitat loss.
Pam added: “Although they’re not a big and impressive looking animal, they are still important as they are a native species, which need protecting.”
The wetland molluscs can grow up to 20mm in length. They feed on aquatic plants and bacteria.
DZG’s mud snails feed off a crushed large lettuce leaf once a week.