The difference between warm-blooded and cold-blooded animals involves the body temperature of the animal. Birds and mammals have warm blood and attempt to keep their internal parts at a set temperature. In a colder envir... More »

Birds and mammals are warm-blooded animals because they can keep their body temperatures constant regardless of the surrounding temperatures. Birds and mammals can regulate their temperatures through different methods. More »

"Warm-blooded" is used to describe animals that generate their own heat. Warm-blooded creatures are often called ectotherms. Mammals and birds are warm-blooded; reptiles and amphibians are cold-blooded. More »

Blood, a liquid made up of plasma and cells, has several functions including controlling body temperature, supplying oxygen and nutrients, removing waste, assisting the immune system and transporting hormones. Blood cell... More »

The five functions of the human circulatory system are the transportation of hormones, oxygen and nutrients; the removal of waste; the stabilization of the pH of bodily fluids; the maintenance of body temperature; and th... More »

Large animals need a circulatory system because the cells in the interior of their bodies are too distant from the surface for absorbed oxygen to diffuse to them sufficiently. By circulating fluid carrying oxygen to thes... More »

The word "hog" refers to all animals known as swine while a "pig" is a young animal, according to America's Heartland. The Environmental Protection Agency concurs with this definition as it is used in the agricultural pr... More »