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.
Anemia can be caused by the body not making enough red blood cells. It is also caused by their loss or destruction. Too little iron, vitamin B12 or folate. A shortage of folate can cause megaloblastic anemia, where red blood cells are large and pale (see Fact Sheet 121).