Study Finds 95 Cassowaries’ Casques Glow Under UV Light, Hinting at Hidden Signals
Updated
Updated · ZME Science · May 21
Study Finds 95 Cassowaries’ Casques Glow Under UV Light, Hinting at Hidden Signals
1 articles · Updated · ZME Science · May 21
Researchers examining 95 adult cassowaries found the birds’ helmet-like casques fluoresce in green-blue patterns under ultraviolet light, a trait largely invisible to humans.
Tests at 365 and 385-395 nanometers showed strong fluorescence in southern and northern cassowaries, while dwarf cassowaries showed little to none and species-specific glow patterns differed.
The study does not prove the casques are used for communication, but it suggests UV-sensitive cassowaries could use the structures to judge identity, size or status during displays in dim rainforest light.
Because cassowaries are living avian dinosaurs, the finding could help scientists interpret the display functions of crests and ornaments in extinct dinosaurs.
The fluorescence also persists in museum specimens, offering a possible tool for identifying incomplete samples, while the next step is testing whether wild cassowaries actually respond to UV cues.
Is the cassowary's glowing headgear a secret language, or just a beautiful, accidental quirk of its biology?
Did dinosaurs use glowing crests for secret communication, just like their modern cassowary relatives?