The largest reptile in the world is the saltwater crocodile, generally 13 to 18 ft. long and weighing up to 2,200 lbs. Females are smaller, usually 7 to 11 ft. and 1,000 lbs.
Possible causes of anemia include: 1  Certain medicines. 2  Destruction of red blood cells earlier than normal (which may be caused by immune system problems) 3  Long-term (chronic) diseases such as chronic kidney disease, cancer, ulcerative colitis, or rheumatoid arthritis.
People become anemic when red blood cells don't carry enough oxygen to the tissues in their body. Various conditions can cause anemia, including an inherited illness called sickle cell anemia, but iron deficiency is the most common cause. The human body needs iron to make hemoglobin, the oxygen-carrying red pigment in blood.