Pair-bonded Java sparrows show enlarged eye rings to signal breeding readiness.
Birds are known for their elaborate courtship rituals and romantic gestures that are replete with beautiful songs, complex dances, gift-giving practices, preening, and flamboyant plumage. While changes in colorful external attributes during this period has attracted much attention, the role of facial features remains an under-investigated aspect of this behavior.
The experiment lasted 12 weeks and involved 44 adult sparrows from a laboratory population. Soma details,"We compared individual changes in the eye ring size between birds paired with preferred mates, those paired with non-preferred opposite-sex individuals, and single birds." The results show that eye ring changes, in addition to duet dancing and vocal and non-vocal sound communication, play an important role in communication between pair-bonded Java sparrows.A new study shows that house sparrows' health closely correlates with urban density, and that sparrows are carrying surprisingly high loads of lead in their ...
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