Gradual metamorphosis, incomplete and complete metamorposis are common among insects.
Bats use ultrasound to navigate and hunt for prey.
A typical animal of the Andes kept as a beast of burden as well as for its meat and wool.
The best known cartilaginous fish, sharks, do not chew their food; they use their razor-sharp...
Herbivorous freshwater fish used as food in many parts of the world.
This animation demonstrates birds´ bones and eggs through the example of the common blackbird.
The dentition of different species of mammals reflect their feeding habits.
Find out the difference between the two species of this magnificent animal: the African and...