An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.
The anatomy of annelids is demonstrated through the example of the common earthworm.
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
A type of large freshwater crayfish widespread in Europe.
Many freshwater fishes are also popular as food.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
This animation demonstrates the anatomy of birds through the example of mallards.
River locks make rivers with great level differences safe for boating.
Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.
One of the most common types of flatworms.
Cosmopolitan monocots inhabiting watersides.
A widespread snail species, also popular as food.
While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.