Common earthworm

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

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Blue whale

Marine mammals, the largest known animals to have ever existed.

American bison

The American bison is the largest land animal in North America.

The reproduction and development of insects

Based on their life cycle, insects can be grouped into three categories: ametabolous,...

European mole

Moles are small subterranean mammals with modified, spade-like forelegs.


The archaeopteryx shows characteristics of both birds and reptiles. It is probably the...

Pteranodon longiceps

A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary...


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

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