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#thyroid gland #overactive thyroid #hyperthyroid #endocrine system #high metabolism #thyroid hormone

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#metabolic rate #high metabolism #endothermy #active lifestyle #internal energy

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#tiny shrew #energetic animal #high metabolism #small mammal #scurrying

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#hummingbird #energetic bird #fast bird #high metabolism #tiny bird #quick bird

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#hummingbird #energetic bird #fast wings #hovering bird #high metabolism #colibri speed

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#voracious shrew #hungry shrew #animal shrew #insectivore #high metabolism