Evolution

A nail is a horn-like keratinous envelope covering the tips of the fingers and toes in most primates. Nails evolved from claws found in...

Thousands of years ago, a group of people took a walk in what is now Tanzania. The footprints they left behind are now offering...

The lungs are the principal organs of the respiratory system in humans and many other animals including several fishes and some snails. In mammals...

Peacock or Peafowl is a common name for three species of birds in the genera Pavo and Afropavo of the Phasianidae family, the pheasants...

One of the most patient mammals, camel is an even-toed ungulate in the genus Camelus that exhibits unique fatty deposits known as "humps" on...

Zebras are numerous species of African equids coupled with their distinctive black-and-white striped coats. Their stripes come in diverse patterns, unique to each individual....

Pigs are mammals with fat yet cute bodies, flat snouts that can move independently of their heads, tiny eyes and large ears. They are...

Summary Snakes are elongated, legless, carnivorous reptiles which has scared generation after generation. Many species of present day snakes have skulls with several more joints...

Summary Butterfly evolution is the origin and diversification of butterflies through geologic time and over a large portion of the Earth's surface. The earliest known...