Relating to or belonging to the subfamily Halcyoninae of kingfishers; characteristic of tree kingfishers and related species.
Adjectival form of 'Halcyoninae,' using the '-ine' suffix to convert the subfamily name into an adjective describing related characteristics or species.
When ornithologists say 'halcyonine traits,' they're referring to specific behaviors and features that all the kingfishers in this subfamily share—it's like a bird family's personality type.
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