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The Arctic tern is famous for its long migration route: it flies from the Arctic to the Antarctic and back again each year.
Let’s see how a bear, which the most popular children's toy was modelled after, lives in real life.
Deinonychus antirrhopus, the 'terrible claw', was a carnivorous dromaeosaurid dinosaur.
A blood clot that forms in the deep veins of the lower limbs can cause a fatal pulmonary embolism if it enters the lungs.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
One of the most common tree of the pine family, native to Eurasia.
Many of the most important food crops we consume belong to the family of nightshades.
The axolotl, also known as Mexican salamander, is an amphibian species that keeps its gills even in adulthood.
Lemurs only live on the island of Madagascar. Here are a number of fascinating facts about them.
Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.
This animation helps you learn the basics of healthy eating.
The American bison is the largest land animal in North America.
There are two basic cell types: prokaryotic and eukaryotic cells.
The adrenal glands are responsible for maintaining homeostasis and producing a rapid response in stressful situations.
Noise surrounds us everywhere, but it can be harmful. Let's see how.
Quetzalcoatlus was one of the largest known flying animals of all time.
Learn more about the early stages of human development with this lesson.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.