Red deer

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

Grass snake

A type of snake with a characteristic spot on its neck.

Common carp

Freshwater fish used as food in many parts of the world.


The fastest track-based means of urban transport.


This animation demonstrates the anatomy of birds through the example of mallards.

Male reproductive system

The reproductive system consists of organs which work together for the purpose of reproduction.

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Types of synovial joints

Synovial joints can be categorised by the direction of movement they allow.

Patellar reflex

The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.


The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

Female reproductive system (intermediate)

The reproductive system is a series of organs working together for the purpose of reproduction.

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.


ATP is the main source of energy for cells.


NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.

Hypothalamic-pituitary axis

The Hypothalamic-pituitary axis is the regulating centre of our endocrine system.

Types of gears

Two meshing gears transmit torque during their rotational motion.

Cities of the world

This animation demonstrates the geographical locations of the Earth's major cities.

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