According to The Guardian, the UN estimates that between 150-200 species of plants and animals become extinct each day, many without ever being officially discovered and classified by scientists. Mother Nature Network id... More »

www.reference.com Science Biology Zoology

Some animals that have become extinct during the past century include the Golden Toad, the Zanzibar Leopard, the Po'ouli, the Pyranean Ibex and the West African Black Rhinoceros. Other extinct species include the Quagga,... More »

www.reference.com Science Biology Zoology

The last of the mammoths survived in Alaska about 10,000 years ago. No definite reason has been attributed to the demise of the mammoths, though several factors, such as climate change, the arrival of humans and even met... More »

www.reference.com History Prehistory

Organisms of all types are classified to make it easier to identify species of plants and animals, to help sort and track similarities and differences between different parts of various kingdoms and to help scientists de... More »

Nitrogen is required for plants and animals to grow and to survive. Plants and animals need nitrogen for the production of amino acids that make up proteins and DNA. More »

www.reference.com Science Biology Zoology

Rhinoceros vipers, which are known to scientists as Bitis nasicornis, are sedentary pit vipers that hail from the forests of central Africa. These snakes are primarily associated with forest pools and low-lying areas tha... More »

www.reference.com Science Biology Zoology

Although not every species in existence has been specifically studied for sleep patterns, scientists generally agree that all organisms need to sleep in some fashion. Sleep patterns differ from species to species, though... More »