From one million wildebeest crossing croc-infested waters to a manatee’s journey to warmer waters, here’s a closer look at 7 daring animal migrations.

Video timeline: 0:00 Intro to 7 Daring Animal Migrations | Smithsonian Channel 1:00 1 million wildebeest cross these croc-infested rivers 2:51 The largest mammal migration in the world 4:19 The pragmatic way African buffalos organize their herds 7:06 Thousands of monarch butterflies take flight 11:03 A manatee embarks on an inland journey to warmer waters 14:05 Yellowstone bison are built for winter survival 18:00 Why birds flock to this South African nature reserve