Study
Electroreception and the feeding behaviour of platypus (Ornithorhynchus anatinus: Monotremata: Mammalia)
Manger, Paul R.; Pettigrew, John D.
Philosophical Transactions of the Royal Society B: Biological Sciences, 1995
The distribution and density of electroreceptors and mechanoreceptors across the platypus bill were mapped, and related to the animal's characteristic side-to-side head sweeping during foraging and to the electrical signals produced by its prey.
- Studied in
- Ornithorhynchus anatinus
- Sample size
- receptor mapping combined with behavioural observation
The bill carries tens of thousands of receptors of two kinds, arranged in stripes running across it: electroreceptors sensitive to fields, and push-rod mechanoreceptors sensitive to touch and water movement. Prey such as shrimp produce brief electrical pulses when they flick their tails. Because an electrical signal arrives essentially instantly and a mechanical disturbance travels more slowly, the delay between the two encodes distance to the source.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
The platypus combines electrical and mechanical information from the same bill, using the arrival-time difference to locate prey in three dimensions.
How NatureHQ reads it
This is the part that turns a curiosity into a system, and it is the reason NatureHQ does not present the platypus as a bag of unrelated oddities. Two senses in one organ would be interesting on their own; two senses whose *timing difference* gives range is a mechanism, and it is the same trick as counting the gap between lightning and thunder. Everything else about the animal's foraging — the closed eyes, the head sweep, the oversized bill — is downstream of it.
- The distance-by-delay model is inferred from receptor arrangement and signal physics rather than demonstrated by direct neural recording during a strike.
- Prey electrical signals were characterised for a limited set of species.
- How the two channels are integrated in the brain is described anatomically rather than functionally.
Two senses in one bill, and the gap between them
How does a platypus work out not just the direction of prey but how far away it is?
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: The Royal SocietyPublished by the Royal Society.
doi.org/10.1098/rstb.1995.0030
This reference was resolved automatically against Crossref on 2026-08-11.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-08-11.