How Platypus Inspired Electroreception Sensors

Ornithorhynchus anatinus · Animal · Eastern Australian rivers and streams

What if the solution to passive electric field detection had already been perfected — by a platypus over 50 million years of evolution?

The Natural Innovation

The platypus hunts underwater with its eyes closed, locating prey by detecting the tiny electric fields generated by their muscle movements. Its bill contains 40,000 electroreceptors and 60,000 mechanoreceptors, allowing it to triangulate the exact position of shrimp from 20 cm away in murky water.

The platypus lives in Eastern Australian rivers and streams.

In the language of biomimicry, this falls under the Sense › Detect weak electric fields category.

The Design Principle

An array of electroreceptors with overlapping fields and differential readout allows triangulation of an electric dipole source — pinpointing the precise location of a bioelectric signal without any emitted signal from the detector itself.

Human Applications

Sensitive electrochemical sensors for detecting heartbeat signals through water, non-invasive cardiac monitoring systems, and underwater object detection for military and search-and-rescue applications.

Real-world implementations include: Electrosensory cardiac monitor concepts, electroreceptive AUV (autonomous underwater vehicle) sensors, medical capacitive sensing array designs.

Source: AskNature.org