Background. Mammalian hibernation in thirteen-lined ground squirrels (Ictidomys tridecemlineatus) is characterized by dramatic changes on a physiological and molecular level. During hibernation. mammalian hearts show a propensity to hypertrophy due to the need for increasing contractility to pump colder and more viscous blood. https://countryscenesaddleryandpetsuppliers.shop/product-category/leather-coasters/