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Hydrozoa, or hydroids, are an invertebrate, with about 3,700 known species. Most hydroids live in salt water environments, but some have moved into freshwater habitats. They can either live separately or live in colonies.

This smooth red pebble is a variety of quartz.

Mitra mitra, common name the Episcopal miter, is a species of large predatory sea snail, a marine gastropod mollusk in the family Mitridae, the miters.

This smaller cousin of the beaver comes from wetlands in North America

This stone got its name because its red inclusions look like fragments of broken terracotta pots.

Like the different coloured varieties of quartz, such as amethyst and citrine, agates inherit their colours from the variations in composition of trace elements in the fluids that deposited the mineral layers. They are often cut and polished for souvenirs or ornaments..

Like other molluscs, the majority of land snails are hermaphrodites, having both male and female sex organs. In many parts of the world such snails are farmed as food