The ancestors of Arachnida and Crustacea belonged to the class Trilobita.

Diversity of light-detecting organs

Several analogous types of eyes have developed independently through convergent evolution.

Woolly mammoth

Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.

Fat-tailed scorpion

The fat-tailed scorpion is one of the world's most dangerous scorpions.

Vertebrate brain evolution

During the evolution of vertebrates the relative development of brain areas has changed.


Pearls, often used as gemstones, are the by-products of certain molluscs' protective...

Eastern grey kangaroo

One of the largest marsupials.

Freshwater pearl mussel

A species of mollusc widespread in freshwaters.

Red deer

Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.

Comparison of real fruits and pseudofruits

The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits...


Enzymes are protein molecules catalysing biochemical reactions. Their activity can be...

Common earthworm

The anatomy of annelids is demonstrated through the example of the common earthworm.

Southern wood ant

An ant colony consist of a queen, male ants and workers.

European honeybee

Honeybees produce a sweet and nutritious substance, honey.


Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy,...

Horse chestnut

This animation demonstrates how horse chestnut trees change throughout the seasons

Amoeba proteus

Widespread heterotrophic unicellular organisms with constantly changing shapes


The most ancient group of animals, they live underwater, lack real tissues and body symmetry.


Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group...


A type of herbivorous dinosaur easily recognisable by its large frill and three horns...

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