Tropical Birds’ Eye Rings Swell As A Sign Of Love, New Research Reveals

The findings, published in the journal PLOS One, show that eye ring changes, in addition to duet dancing and vocal and non-vocal sounds, play an important role in communication between courting couples PHOTO BY MAX LETEK/UNSPLASH

A tropical bird’s eye rings swell when they are in love, reveals new research.

Both male and female Java sparrows display enlarged eye rings to signal their readiness to breed, say scientists.