Firefly Courtship Code Lab: Flash-Pattern Recognition (2D)

Flash Code

Male code interval 3.00 s

Female recognition template 3.00 s

Recognition tolerance (±) 0.35 s

Female response delay 1.00 s

Population

Patrolling males 24

Detection range 15%

Live Readout

Elapsed time

0.0 s

Flashes emitted

Pairings

Mismatched code

Unanswered

Success rate

0.0%

How it works

Real fireflies (family Lampyridae) don't just glow — males patrol emitting a species-specific interflash interval (IFI), the timing gap between successive flashes, which acts as an identity code (Lloyd, 1966). A perched female runs a coincidence-detector: she times the gap between two flashes she sees from the same male, and only if that gap falls inside her innate recognition window does she answer, after her own species-typical delay. The male, in turn, only recognizes a reply that lands inside his expected response window — so pairing requires both directions of the code to line up.

This sim implements exactly that timing filter, not a decorative animation:

Male code interval vs female template — detune them and pairings collapse even though flashes never stop; this is the real mechanism behind reproductive isolation between co-occurring firefly species.
Tolerance sets how forgiving the coincidence window is on both ends of the exchange.
Response delay is the female's timed answer; males only accept a reply inside delay ± tolerance.
A male whose flash goes unanswered in time (timeout) resumes patrolling; a matched exchange makes him fly straight at her measured position until he lands beside her.

Male flash Female answer Mismatched code (ignored)