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Julia Simon ,
More and more companies are pledging to cut carbon emissions. Many say they ll buy carbon offsets that save forests, but counting how much carbon is actually saved is fuzzy math. Listen • 3:44
About The Monarch Migration
Each year, millions of monarch butterflies fly some 3,000 miles, from their summer breeding grounds as far north as Canada to their overwintering sites in the oyamel fir forests of central Mexico. It is one of the Earth s great migrations, and it s also one of the best studied. In recent years, ecologists like Sonia Altizer have been able to better answer how and why these intrepid butterflies make the journey.
The
how is owed to a complex suit of navigational and physiological adaptations. Migrating monarchs have internal sun and geomagnetic compasses, and the monarchs that make the longest trek actually grow to be bigger and more powerful fliers, particularly the females. They can even read the skies like a meteorologist, finding and following air currents to quicken their travels. Peering into their genes has also revealed more clues into how they evolved this migratory behavior.
About The Monarch Migration
Each year, millions of monarch butterflies fly some 3,000 miles, from their summer breeding grounds as far north as Canada to their overwintering sites in the oyamel fir forests of central Mexico. It is one of the Earth s great migrations, and it s also one of the best studied. In recent years, ecologists like Sonia Altizer have been able to better answer how and why these intrepid butterflies make the journey.
The
how is owed to a complex suit of navigational and physiological adaptations. Migrating monarchs have internal sun and geomagnetic compasses, and the monarchs that make the longest trek actually grow to be bigger and more powerful fliers, particularly the females. They can even read the skies like a meteorologist, finding and following air currents to quicken their travels. Peering into their genes has also revealed more clues into how they evolved this migratory behavior.