Why and how do birds migrate at night?

It's common to see Canada Geese flying in formation during fall or spring migration, but there are many birds whose journeys we do not witness. Many birds, such as orioles, sparrows and warblers, seem to just disappear when the weather gets colder, and then they reappear in the spring. About 80% of the birds who migrate, make their journeys at night.
Chapters:
Introduction 00:00
Calmer air 00:49
Cooler temperatures 01:15
Fewer predators 01:38
Magnetic field 02:01
Magnetite crystals 02:38
Conclusion 03:03
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Photos and video sources:
Canva.com
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Elements.envato.com
Pexels.com
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Videvo.net
Wikipedia Creative Commons License
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Credits in order of appearance:
Introduction
-Canada geese flying, audio added, by James Brey from Canva.com
-Cranes flying at sunset by Schroptschop from Canva.com
-Pushing rock up hill graphic by Leremy Gan from Canva.com
-Starry night sky by forrestbro from Canva.com
-Cranes in flight from pomarinus from Canva.com
-Man bird watching by middelveld from Canva.com
Calmer Air
-Calm lake landscape by Anahita Daklani-Zheleva from Canva.com
-Turkey vulture soaring by PowerVine from Canva.com
-Time lapse of crescent moon by BlackBoxGuild from videvo.net
-Common cranes flying by Great_bru from elements.envato.com
Cooler Temperatures
-Time lapse sunset on lake by pressdigital from Canva.com
-Cranes in flight by pomarinus from Canva.com
Fewer Predators
-Night sky time lapse by Maria Tomsic from Pexels.com
-Great horned owl by Forrest Brown from Canva.com
-Red fox by BlackBoxGuild from elements.envato.com
-Cooper's hawk by BlackBoxGuild from elements.envato.com
Magnetic Field
-Sea and birds by ahmet odabas from Canva.com
-Earth's magnetic field dynamics by blueringmedia from Canva.com
-Blackburnian warbler by Sean Graesser from Canva.com
-Cryptochrome structure from Protein Data Base, Public Domain
-Ribbons in a pile by vizion-photography from Canva.com
Magnetite Crystals
-European robin by Film Studio Aves from Canva.com
Conclusion
-Migrating cranes by Schroptschop from Canva.com
-Winter migration from Great_bru from elements.envato.com
Thumbnail photo credit: Migration at sunset by zizar2002 from Canva.com

[@OspreyFlyer]

👍♥

[@frednorman1]

I’ve read this before, but astonishing that birds might navigate byusing electromagnetic fields

[@kcannon333]

Great video, love the graphics

[@allthingsbirdie]

Thank you!

[@OldSchool1947]

So. They follow their “noses!”

[@Achilles_Heelys]

is there any more info on how cryptocones function? super cool

[@allthingsbirdie]

I'll add it to my list!