White blood cells are much less common than red blood cells. There are five types of white blood cell (leucocyte). These are divided into two main classes

1.Granulocytes (includes Neutrophils, Eosinophils and Basophils)
2.Agranulocytes (includes Lymphocytes and Monocytes).
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All the white blood cells are able to move like an amoeba, and can migrate out of blood vessels into the surrounding tissues. :)
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