Thermoception or thermoreception is the sense by which an organism perceives temperature. In larger animals, most thermoception is done by the skin. The details of how temperature receptors work is still being investigated. Mammals have at least two types of sensor: those that detect heat (i.e. temperatures above body temperature) and those that detect cold (i.e. temperatures below body temperature).

A particularly specialized form of thermoception is used by Crotalinae (pit viper) and Boidae (boa) snakes, which can effectively see the infrared radiation emitted by hot objects. The snake's face has a pair of holes, or pits, lined with temperature sensors. The sensors indirectly detect infrared radiation by its heating effect on the skin inside the pit. They can work out which part of the pit is hottest, and therefore the direction of the heat source, which could be a warm-blooded prey animal. By combining information from both pits, the snake can also estimate the distance of the object.

The common vampire bat may also have specialized infrared sensors on its nose (see [1]). A nucleus has been found in the brain of vampire bats that has a similar position and has similar histology to the infrared nucleus of infrared sensitive snakes.

Other animals with specialized heat detectors are forest fire seeking beetles (Melanophilia acuminata), which lay their eggs in conifers freshly killed by forest fires. Darkly pigmented butterflies Pachliopta aristolochiae and Troides rhadamathus use specialized heat detectors to avoid damage while basking. Blood sucking bugs Triatoma infestans may also have a specialised thermoception organs.


Kishida R, Goris RC, Terashima S, Dubbeldam JL. (1984) A suspected infrared-recipient nucleus in the brainstem of the vampire bat, Desmodus rotundus. Brain Res. 322:351-5.

Campbell A, Naik RR, Sowards L, Stone MO. (2002) Biological infrared imaging and sensing. Micron 33:211-225. pdf.
Senses are the physiological methods of perception. The senses and their operation, classification, and theory are overlapping topics studied by a variety of fields, most notably neuroscience, cognitive psychology (or cognitive science), and philosophy of perception.
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  • Chromalveolata
  • Heterokontophyta
  • Haptophyta
  • Cryptophyta
  • Alveolata

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  • trillion fold).]]

    Temperature is a physical property of a system that underlies the common notions of hot and cold; something that is hotter generally has the greater temperature. Temperature is one of the principal parameters of thermodynamics.
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    Skin layers: epidermis, dermis, and subcutis, showing a hair follicle, sweat gland & sebaceous gland.]] In zootomy and dermatology, skin is the largest organ of the integumentary system made up of multiple layers of epithelial tissues that guard underlying muscles and organs.
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    Linnaeus, 1758

    Subclasses & Infraclasses
    • Subclass †Allotheria*
    • Subclass Prototheria
    • Subclass Theria

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    Oppel, 1811

    • Crotalini - Oppel, 1811
    • Crotales - Cuvier, 1817
    • Crotalidae - Gay, 1825
    • Crotaloidae - Fitzinger, 1826
    • Cophiadae - Boie, 1827
    • Crotaloidei - Eichwald, 1831
    • Crotalina - Bonaparte, 1831

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    Gray, 1825

    • Acrantophis
    • ''Boa
    • Candoia
    • Corallus
    • Epicrates
    • Eryx
    • Eunectes
    • Gongylophis
    • Sanzinia

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    Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. The name means "below red" (from the Latin infra, "below"), red being the color of visible light with the longest wavelength.
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    Vampire bats are bats that feed on blood (hematophagy). There are only three bat species that feed on blood: The Common Vampire Bat (Desmodus rotundus), the Hairy-legged Vampire Bat (Diphylla ecaudata), and the White-winged Vampire Bat (Diaemus youngi).
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    A. (P.) aristolochiae

    Binomial name
    Atrophaneura (Pachliopta) aristolochiae
    (Fabricius, 1775)

    The Common Rose (Atrophaneura (Pachliopta) aristolochiae
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    T. infestans

    Triatoma infestans is a blood-sucking bug (like all the members of its subfamily Triatominae) and the most important vector of Chagas disease.
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