No animal on Earth has four knees, only two. All animal skeletons consist of essentially the same bones and joints, just expressed in different shapes or forms.Continue Reading
All creatures that exist with four limbs, comprising the legs and arms, fall in the category of tetrapods. This word comes from Greece and means "four legs." The animals in this group all share the same basic skeletal structure, which consists of two arms, two legs, a torso and a head. Since all animals belong to this group, all animals have only two "real" legs and two "real" arms. So, although evolution may have shaped some species' arms into shapes that appear to be legs, they are still essentially arms.
Take a horse for instance. The two front legs are actually arms, just shaped that way over millions of years of evolutionary pressure. Because of this, there are no physiological knees within the front two legs of a horse. They are actually elbows that have been shaped to serve a similar purpose to the kneecap on the hind legs. In fact, horses have specialized their arm shape so drastically over the years that their hooves are actually nothing but their middle fingers.
It should be pointed out that not every tetrapod is equipped with four limbs in modern times. Whales have partially lost some of their limbs, with fragments still being visible in skeletons. Additionally, snakes have completely lost all four of theirs.Learn more about Zoology
A few of the animal science careers that involve working directly with animals include working for zoos, kennels, farms, wildlife preserves and universities as a veterinarian, behaviorist, nutritionist, scientist, trainer or caretaker. Some professions that do not involve direct work with animals but still require familiarity with animal science include doctors, pharmacists, geneticists, writers and teachers.Full Answer >
The strongest animal on Earth is the blue whale. The blue whale is also the largest creature in the entire world.Full Answer >
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 be only during the mating season that individual members of a species interact with each other.Full Answer >
The animal with the strongest bite force of any living animal today is the saltwater crocodile. This crocodile has a bite force of 3,700 pounds per square inch.Full Answer >