Bird Subspecies: Another Layer of Diversity

The Science of Birds

Ivan Phillipsen

Biology, Natural History, Birds, Birding, Science, Life Sciences, Birdwatching, Nature

4.8 • 960 Ratings

🗓️ 2 October 2025

⏱️ 47 minutes

🔗️ Recording | iTunes | RSS

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Summary

👕 Bird Merch — Get yourself some bird shirts! ~~~ In Episode 123 Ivan Phillipsen explores the fascinating world of subspecies—the diversity that exists within bird species. Learn how these populations arise, why ornithologists sometimes struggle to define them, and what makes the concept so important for both science and conservation. From the record-breaking Island Thrush, once thought to have more subspecies than any other bird, to chickadees, sparrows, and hawks closer to home, Ivan...

Transcript

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0:00.0	Let's say that you are about to begin a grand birding tour of the Indonesian archipelago.
0:09.5	Borneo, Sumatra, Java, Sulawesi, and New Guinea are just some of the tropical islands
0:16.7	you'll be visiting.
0:18.1	How exciting, right?
0:19.1	Well, imagine you're sitting on the plane heading to your
0:22.1	first destination. In anticipation of all the avian wonders ahead, you're studying a bird field guide.
0:30.1	You land on the page featuring a bird called the Island Thrush, Tertus Poliocephalus. The illustrations show that this bird has some plumage variation.
0:42.0	Some forms are darker, some have rusty red tones, some are more gray, and so on. But you soon
0:49.4	lose interest. You think, enough with the island thrush already. And you flip the page, hoping to find
0:56.0	some pretty pictures of more colorful birds, birds that seem more exotic than the island thrush.
1:03.6	But what's this? The next page shows more variations of the island thrush. And so does the next page and the next. It just keeps going.
1:14.6	You can't believe it. You flip back to the beginning and count all the variations of this species.
1:20.3	You end up with 52. This bird has 52 subspecies. It's as if your book should be titled, A Field Guide to the Island Thrusch.
1:31.7	Little did you know that the island thrush is actually famous for having more subspecies than any
1:37.4	other bird in the world. Or I suppose I should say that the island thrush was famous for that particular superlative.
1:47.0	Things have recently changed for the thrush.
1:55.0	Hello and welcome. This is the Science of Birds.
2:03.6	I am your host, Ivan Philipson.
2:09.6	The Science of Birds podcast is a light-hearted exploration of bird biology for lifelong learners.
2:16.6	This episode, which is number 123,
2:20.6	is all about the diversity of birds below the level of species.
2:25.9	The way that populations within a single species
	...

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