The Science of Birds

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This is Episode 134. Ivan takes on one of the most iconic bird families in the avian world: Accipitridae—the hawks, eagles, kites, buzzards, harriers, and Old World Vultures. It's a massive and diverse group with no good nickname, though Ivan has a few suggestions.
The episode covers the key traits that make these birds such formidable predators—from their hooked bills and locking talons to the bony "brow ridge" that gives them their signature scowl. Ivan also digs into the family's staggering diversity: 249 species across 73 genera.
Along the way, there's some evolutionary biology, a Weirdo Alert, and a look at the ancient giant that makes today's largest eagles seem modest by comparison.
Links of Interest
Haast's Eagle episode of the Blurbs podcast
Harpy Eagle video in Spanish, by Alberto Lobato [VIDEO]
Wild Latitudes: Worldwide birding and nature tours.
Link to this episode on the Science of Birds website
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In this From the Field episode Ivan takes listeners along on a two-week scouting trip to Romania where he explored the country's remarkable natural landscapes in preparation for a future birding tour. There's just one catch: his binoculars broke almost immediately after arriving.
Despite that setback, Ivan racks up some lifers and shares highlights from two very different corners of the country. First, he heads to the Danube River Delta on the Black Sea coast—widely considered the best birding site in Europe—where he had an unforgettable day exploring the maze of channels by boat. Then he crosses the Carpathian Mountains into Transylvania, where ancient forests, castles, charming villages, stork nests, and bears round out the adventure.
Link to this episode on the Science of Birds website
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In each Random Bird Thursday (RBT) episode, the goal is to highlight a bird species that probably isn't going to get featured in a full-length podcast episode. These are birds we might overlook, even though they certainly deserve some appreciation and attention. 
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⚠️ SPOILER ALERT!
The featured species in this episode is the Jungle Owlet (Glaucidium radiatum).
Sound Citations:
Dr S S Suresh, XC1102415. Accessible at www.xeno-canto.org/1102415
Swami Bogim, XC1037332. Accessible at www.xeno-canto.org/1037332.
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~~~
In Episode 132, Ivan Phillipsen explores the "circulatory system of the land"—the world of rivers and streams. These flowing-water environments, serve as vital habitats for avian life.
The episode delves into the ecology of these waterways, breaking down the differences between clear, rocky upland streams and the warmer, sediment-rich rivers of the lowlands. Listeners will learn about the distinct "zones" of a stream—from the central channel to the lush riparian zone—and discover what resources birds need to thrive in these high-energy environments.
At the heart of the discussion are the "stream specialists"—a select group of approximately 60 bird species worldwide that are evolutionarily tied to flowing water. From the underwater antics the American Dipper to the massive, fish-hunting Blakiston’s Fish-Owl, the episode highlights the incredible adaptations of birds that make their living among the rapids. Whether exploring the global diversity hotspots of the Himalayas or the secretive lives of "streamcreepers," this episode is an inviting look at the birds that call the water's edge home.
Wild Latitudes: Worldwide birding and nature tours.
Link to this episode on the Science of Birds website
🔥 Bird Merch - 20 New Shirt Designs!
Support the show

In each Random Bird Thursday (RBT) episode, the goal is to highlight a bird species that probably isn't going to get featured in a full-length podcast episode. These are birds we might overlook, even though they certainly deserve some appreciation and attention. 
~~~~~~~~~~~~~~~~~
⚠️ SPOILER ALERT!
The featured species in this episode is the Bicolored Antbird (Gymnopithys bicolor).
Sound Citations:
Niels Krabbe, XC250916. Accessible at www.xeno-canto.org/250916.
Johan Chaves, XC949385. Accessible at www.xeno-canto.org/949385.
Niels Krabbe, XC248252. Accessible at www.xeno-canto.org/248252.
Patricio Mena Valenzuela, XC275411. Accessible at www.xeno-canto.org/275411.
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