Why these birds are defined by the unique anatomy of their vocal organs

Nature · Published 3 October 2026 Swipe more like this →

In short: The Tyranni, or suboscines, are a massive group of over 1,000 passerine bird species. While they share a common ancestry, they are distinguished from their songbird cousins by the specific structure of their syrinx muscles. Originating in South America 50 million years ago, these birds have a complex evolutionary history.

The Tyranni suborder represents a significant branch of passerine birds, primarily concentrated in South America. Their classification hinges on the anatomy of the syrinx, the vocal organ of birds, which differs fundamentally from that of the oscines, or true songbirds. This anatomical distinction is the primary reason they are commonly referred to as suboscines.

Evolutionary evidence suggests that this group emerged roughly 50 million years ago within South America. During the Oligocene epoch, these birds expanded their range, likely crossing the Atlantic to reach the Old World. This migration is supported by fossil records found in Europe, including extinct genera such as Crosnoornis, Jamninkaornis, and Wieslochia, all discovered in rocks dating back to that period.

Taxonomically, the suborder is split into two main infraorders: the Eurylaimides and the Tyrannides. The Eurylaimides are largely found in tropical regions near the Indian Ocean, with the exception of the sapayoa, an American species. Conversely, the Tyrannides encompass the vast majority of American suboscines. Researchers have debated how to organize these clades, moving away from older, obsolete parvorder systems toward more precise groupings based on molecular genetic studies, such as the 2019 work by Carl Oliveros and his team.

Within the Tyrannides, scientists distinguish between two major lineages: the tracheophones, which include groups like ovenbirds and antbirds, and the bronchophones, which contain tyrant-flycatchers, cotingas, and manakins. While DNA hybridization was once used to map these relationships, it proved unreliable, leading to the current reliance on modern phylogenetic data to clarify the complex family tree of these diverse birds.

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