Why giraffes will become short again?

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The evolution of mammals is traced from their origins as small bulk animals to their adaptation against increasing gravity. With the development of 4-chambered hearts and robust circulatory systems, mammals initially grew larger. However, as gravity intensified, they faced challenges that led to a gradual reduction in size, a trend that is expected to continue. This exploration delves into the biological and environmental factors influencing the ongoing process of body size minimization in mammals.