BirdNote Daily

Over 130,000 years ago, White-throated Rails migrated across hundreds of miles from Madagascar to the tiny island of Aldabra. Fossil records show that these wayward birds evolved to be entirely flightless, and went extinct when the island was lost to sea level rise. But some 20,000 years later, Aldabra reemerged from the Indian Ocean and a new wave of rails settled in. Today, the Aldabra subspecies of White-throated Rails are flightless once again! It’s a rare example of a phenomenon called iterative evolution.
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Do you ever see flocks of birds in your yard that show up in droves one year, but are completely absent the next? Some nomadic species such as Pine Siskins move based on the availability of food and habitat. It’s called irruptive migration, and it sometimes leads to backyards full of siskins. While these flocks are a delight for bird watchers, the dense groups can easily transmit diseases such as salmonellosis.
This episode is brought to you by Wild Delight Bird Food, which aims to support wild bird populations with clean, nutritious ingredients in every blend. Available at Chewy.com.
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Most bird species in North America mate for a single breeding season. Some may team up again the following year, just because both stay in - or return to - the same territory. Fewer than one-fifth of Song Sparrow pairs are reunited. Hawks, eagles, and ravens have wide territories, thus few contacts with the opposite sex. Maintaining a relationship through the winter may assure breeding in the next season.
More info and transcript at BirdNote.org.
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What is it that draws us to a romantic partner? Birds have lots of ways to catch the attention of a mate. Most cranes duet with prospective partners for years before they begin breeding. Crested Auklets of both sexes produce a pungent citrus perfume. And Blue-footed Boobies dance, showing off their feet to each other.
More info and transcript at BirdNote.org.
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eBird, a project of the Cornell Lab of Ornithology, lets you log the bird species you observe on a smartphone app or on the web. Whether you’re going on a birding trip or enjoying birds near home, you can list the species you found on eBird. Millions of people all over the world help eBird create a detailed picture of bird populations. Data from eBird has helped guide many conservation efforts, from planning new wind farms away from where eagles fly to guiding habitat protection for declining species.
This episode was produced as part of BirdNote’s “From Love to Action” campaign, an effort to inspire people to take action to help birds. To learn more and to tell us how you’re helping birds, visit this link.
More info and transcript at BirdNote.org.
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