Summary
In this episode of "Stuff You Should Know," hosts Josh and Chuck delve into the fascinating world of bird migration. They start by dispelling the common misconception that all birds migrate south for the winter, pointing out that there are over 900 species of birds and not all of them migrate. They explain that the urge to migrate is triggered by a change in the length of the day, known as the photo period, and that about 75% of birds migrate.
The hosts go on to explain that there are two types of migratory birds: obligate migrants and facultative migrants. Obligate migrants are hardwired to migrate and their behavior is predictable, while facultative migrants migrate because they have to, usually due to food scarcity or weather changes. The distance birds migrate varies depending on the species, and some birds may not travel far from their habitat.
One of the most interesting facts the hosts share is that the Arctic tern holds the record for the longest migration on earth, traveling from pole to pole, a round trip of close to 19,000 miles. They also discuss the various methods birds use to navigate during migration, including learning landmarks, using constellations, and sensing the Earth's electromagnetic fields. Some birds may even have a special pigment that allows them to see the fields.
The hosts wrap up the episode with a lighthearted discussion about x-ray glasses and a recommendation for a funny scene from the TV show "Extras." Overall, this episode of "Stuff You Should Know" provides a fascinating look into the world of bird migration, highlighting the incredible abilities of these feathered creatures and the many factors that influence their behavior.
