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Some amphibians and reptiles sense their surroundings in ways that seem extraordinary: a Surinam toad can detect prey by feeling water move, certain snakes register infrared heat, and several groups use chemical or environmental cues to navigate. These are not universal “superpowers.” Each is a specialized solution found in particular animals, and some of the underlying biology is still uncertain.
How a Surinam toad feels prey moving through water
The Surinam toad (Pipa pipa) hunts underwater, often in murky conditions. It extends its forelimbs and detects movement in the surrounding water through specialized fingertip structures. That touch-related sensing can alert it to approaching prey before the animal makes contact, even in darkness. It is a species-specific adaptation, not a sensory ability shared by frogs generally.
A UCLA Newsroom account dated September 8, 2026, reports that each toad has 128 miniature lobules on its fingertips. Although the lobules occupy 8% of the forelimb skin surface, they contain 60% of the arm’s touch-sensitive nerves. The account also says fingertip touch thresholds fall within the same range as human fingertip thresholds. These figures describe the anatomy and sensitivity reported for this specialized system, not a general measure of frog touch.
Corresponding author Duncan Leitch, a UCLA assistant professor of integrative biology and physiology, described the idea this way: “It immediately seemed to me like these lobes might be somewhat analogous to antennae that the frogs extend so they can feel the space around them.” The analogy captures how the toad samples nearby movement, but the input remains touch: water movement stimulates specialized sensory tissue.
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How some snakes sense infrared heat
Pit-bearing snakes—including pit vipers, pythons, and boas—can detect infrared radiation through facial pit organs. This is not ordinary vision and does not mean they see infrared as a color or image. A 2010 Nature study found that infrared radiation warms the pit organ, activating TRPA1 channels on sensory nerve fibers. In other words, the mechanism is radiant heating, with the warmed tissue and its nerve channels providing the signal.
This ability is limited to snakes with the relevant pit-organ system. It should not be generalized to all snakes or reptiles, and it differs from the Surinam toad’s movement-sensitive touch: one responds to water displacement, the other to heat produced by incoming infrared radiation.
How snakes and lizards sample chemical traces
In snakes and lizards—together, the squamates—tongue-flicking is a way to collect chemical information. Chemicals picked up by the tongue are delivered through the mouth to paired vomeronasal organs. The two sides can retain separate chemical information, allowing an animal to compare signals and move toward the stronger one.
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- AUDBN FG: REPTILES/AMPHIBIANS
How amphibians and reptiles use cues to orient
Patterns in polarized skylight
Research summarized by Cornell reports that amphibians and reptiles can use patterns of skylight polarization for orientation. Polarization is a property of light that varies across the sky; an animal can use that pattern as a directional cue even when it is not relying only on familiar visual landmarks.
Earth’s magnetic field in amphibians
Amphibians can also detect and use Earth’s magnetic field for orientation, according to Cornell’s summary of the research. The behavioral evidence that animals use the cue is distinct from knowing how they detect it: the critical receptor for amphibian magnetic sensing remains unknown. That unresolved mechanism should not be mistaken for evidence that the behavior itself is unobserved.
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- REPTILES & AMPHIBIANS: EAST
Why “amphibian and reptile senses” are not one shared toolkit
These examples differ in the signal detected, the anatomy involved, and how firmly the mechanism is identified. A 2012 review of electrosensory evolution describes mechanoreception and electroreception in the amphibian lateral-line system, but says electroreception was lost in anurans (frogs) and amniotes, including reptiles. So even within amphibians, a sensory trait can be present in some lineages and absent in others.
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| Animal or group | Input | How it is detected or used | Evidence and limits |
|---|---|---|---|
| Surinam toad (Pipa pipa) | Water movement | Specialized fingertip lobules concentrate touch-sensitive nerves. | UCLA’s September 8, 2026 account reports anatomy and prey detection before contact; this is not a trait of frogs generally. |
| Pit-bearing snakes, including pit vipers, pythons, and boas | Infrared radiation as heat | Radiant heating of the facial pit organ activates TRPA1 channels on sensory nerve fibers. | A 2010 Nature study identifies this mechanism; it is not ordinary vision and does not apply to all reptiles. |
| Snakes and lizards | Chemical traces | Tongue-flicking collects chemicals for delivery to paired vomeronasal organs; left-right information can remain separate. | Described for squamates in a University of Connecticut dissertation abstract completed in January 2007. |
| Amphibians and reptiles | Polarized skylight | Patterns in the sky provide an orientation cue. | Summarized by Cornell; the profile reports use of the cue, not a single shared receptor mechanism. |
| Amphibians | Earth’s magnetic field | Magnetic information can support orientation. | Cornell summarizes behavioral evidence; the critical receptor remains unknown. |
| Some amphibian lineages with a lateral-line system | Mechanical and electrical signals | The amphibian lateral-line system includes mechanoreception and electroreception. | A 2012 review says electroreception was lost in frogs (anurans) and amniotes, including reptiles; it is not universal among amphibians. |
The useful comparison is not which animal has the “best” senses. These systems solve different problems: detecting prey in moving water, registering heat, following chemical traces, or orienting with environmental cues. Their value depends on the animal’s anatomy and surroundings.
Quick Recap
Sources
- UCLA Newsroom, “The frog that reads the water with its fingertips” (September 8, 2026).
- Gracheva et al., “Molecular basis of infrared detection by snakes,” Nature 464, 1006–1011 (2010).
- Cornell Department of Neurobiology and Behavior, Kraig Adler research profile.
- Nirvana Iolani Filoramo, University of Connecticut doctoral dissertation abstract (completed January 2007).
- Frontiers in Amphibian and Reptile Science, “The Sensory World of Non-avian Reptiles”.
- Modrell and Baker, “Evolution of electrosensory ampullary organs,” Evolution & Development 14 (2012).
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