Given that the Earth has experienced no fewer than six mass extinctions over the last 500 million years, the list of species that once lived but have gone extinct over the ages is vast. As of 2014, the Center for Biologi... More » Science Biology Zoology

While familiarity with extinct animals varies, the dodo bird and the woolly mammoth can be considered generally well-known. The phrase "to go the way of the dodo" is a common reminder of the bird's extinction. The woolly... More » Science Biology Zoology

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 » Science Biology Zoology

As of 2011, there were an estimated 7.77 million species of animals on Earth, encompassing all phylums and families in the animal kingdom. This number increases to 8.74 million if non-animal species from the plant, fungi... More » Science Biology Zoology

There are many species of animals on Earth that spend the majority of their lives alone, including species of reptiles, amphibians, mammals, fish, insects and arachnids. Solitude is common in the animal world, and it may... More »

Several species of animals are color blind or see muted colors, including dogs, cats, bulls and sharks. Many fish can see muted colors. More »

Some animals that weigh at least a ton include all species of the rhinoceros, the African and Asian elephant, the Asian gaur, and the hippopotamus. Other animals that weigh at least a ton are some species of whale includ... More »