• Are Shrew and Humming bird cold blooded?

  • @srinidhi-v
    Hummingbirds and shrews hatch naked and cold-blooded (poikilothermic, body temperature dependent on the surrounding environment).

    They don’t become warm-blooded (homeothermic, capable of maintaining a stable body temperature regardless of environmental conditions) until their feathers mature enough to create an insulating layer over their skin. They can return to a limited form of poikilothermy as adults when they need to conserve energy, entering the state of torpor overnight or under severe stress.

    This qualifies hummingbirds and shrew as heterotherms.

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