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Many freshwater fishes are also popular as food.
In ecology, a niche is a term describing the way of life of a species.
Marine mammals, the largest known animals to have ever existed.
There are two basic cell types: prokaryotic and eukaryotic cells.
Quetzalcoatlus was one of the largest known flying animals of all time.
A species of venomous snakes widespread in Europe. Its bite is rarely fatal to humans.
The animation demonstrates the most important types of feathers and their fine structure.
Geckos can walk on walls or even ceilings. The 3D scene explains this ability.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
Larvae of this type of mayflies spend the first three years of their lives in water, their adult lives last for only one day which they use for mating.
The animation shows the anatomy of turtles.
While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.
The Arctic tern is famous for its long migration route: it flies from the Arctic to the Antarctic and back again each year.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
The apple is one of the most popular fruits around the world.
One of the most common tree of the pine family, native to Eurasia.
The largest land mammal on Earth.
Many of the most important food crops we consume belong to the family of nightshades.
A mammal with features typical of reptiles: it lays eggs and has a cloaca.
The dromedary is an indispensable animal for inhabitants of the deserts.