Stuff You Should Know Short Stuff: Bird Migration
Feb 1, 2023
Explore the incredible journey of bird migration and the reasons behind it! Discover how some birds use their senses to navigate, even sensing the Earth's magnetic field. Learn about the unique triggers that prompt around 75% of birds to embark on this adventure. Dive into the differences between obligate and facultative migrants and their varying travel habits. Delight in humorous stories and anecdotes along the way, especially about extraordinary travelers like the Arctic Tern. It's a fascinating blend of science and fun!
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Bird Migration Nuances
- Bird migration isn't simply "birds flying south for the winter."
- Over 900 bird species exist, and their migratory patterns vary.
Triggers for Migration
- The urge to migrate, called "migratory restlessness," is often triggered by changes in daylight length.
- This change, the "photoperiod," signals the need to migrate for some species.
Obligate Migrants
- About 75% of birds migrate, often due to daylight cues, not just temperature or food scarcity.
- These "obligate migrants" instinctively migrate based on changing daylight.