From: http://www.estuary.org.nz/

Field guide I made by adapting the 'Avon-Heathcote Estuary-Ihutai Education Resource'. Has photos of the organisms students might see.

Students can use this guide to identify organisms. Laminate it.

You can tell it's a female because of its dome shaped abdomen.

All those little dots are snails.

We caught a few crabs and determined their sex and species. We then released them where we found them.