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Marine mammals, the largest known animals to have ever existed.
Bats use ultrasound to navigate and hunt for prey.
Dogs are the domesticated subspecies of grey wolves.
This animation demonstrates how sonar works.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
The dentition of different species of mammals reflect their feeding habits.
This animation explains the most important characteristics of waves through sound waves.
A mammal with features typical of reptiles: it lays eggs and has a cloaca.
Waves play an extremely important role in many areas of our lives.
Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.
Freshwater fish used as food in many parts of the world.
The train operates between Paris and southern Germany, its cruise speed is 320 km/h.