Conserving the World’s Specialist Riverine Birds

Rivers and the strips of land beside them form one of the most productive edges in nature: energy and matter move constantly between water and land, and a remarkable set of birds has evolved to live on that exchange. This review is the first to treat those birds as a single global group.

We identify 69 species whose lives are built around fast-flowing, high-gradient rivers — from the 8–12 g torrent tyrannulet to the 3.5 kg white-bellied heron. They come from 19 different families, which means river living has been invented again and again across the bird tree of life: ducks, kingfishers, waders, dippers, wagtails, forktails and flycatchers.

The paper maps where these species are concentrated, assembles the evidence on their population trends, and reviews the pressures acting on them: dams and water abstraction, land-use change, pollution, invasive species and climate-driven changes to flow and temperature. Almost two-thirds of the 69 species appear to be declining, and more than 20 are near threatened or worse — yet for most of them, even the basic ecology behind those declines is unknown.

We close with two asks. First, conservation needs to work at the scale of whole catchments, and to protect the tropical and subtropical regions that hold both the most species and the most threatened ones. Second, river birds need interdisciplinary research — from freshwater biologists as much as from ornithologists — on population dynamics, habitat use and prey.

Read it in plain words: what we found on the river birds page. A plain-language summary of this paper also appeared in the Freshwater Biological Association magazine.

Recommended citation: Sinha, A., Chatterjee, N., & Ormerod, S. J. (2026). "Conserving the World’s Specialist Riverine Birds." WIREs Water, 13, e70082.
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