Human and animal bones are distinguished by gross skeletal anatomy, bone microstructure and bone macrostructure. Some human and animal bones are quite similar, making it difficult to identify isolated and fragmentary bon... More »

The animal responsible for the most human deaths worldwide is the mosquito. Mosquitoes carry parasites that spread malaria, a disease that kills roughly two million people every year. More »

Animals that do not have bones are called invertebrates. Invertebrates include many different species of animals, such as jellyfish, slugs, snails, corals, mussels, crabs and lobsters and butterflies. Although these anim... More »

Jellyfish do not have hearts, and they also lack brains and bones. Jellyfish are considered plankton and consist of about 98 percent water. The six parts of a jellyfish include the epidermis, an inner layer, the middle j... More » Science Biology Zoology

Mammals are distinguished from other animals by having mammary glands and complex hair follicles, and by the structure of their skulls, which feature highly modified jaw bones. Mammals are also warm-blooded and have a nu... More »

Major bones on a mouse skeleton include the skull, mandible, scapula, ribs, pelvis, femur, tibia, fibula, radius, ulna, humerus and several vertebrae along the spine. The anatomy of small mice was not fully diagrammed or... More » Science Biology Zoology

Mammals move by using contractile muscles that pull against attachment points in their rigid internal skeletons, causing the bones to change orientation relative to each other around specific joints. This muscle contract... More »