Monarch butterflies descend to the forest floor in order to mate and begin their migration north.
(02:13)Witness the lifecycle of a monarch butterfly - from egg to pupa to adult.
(03:00)Producer Stephanie explains monarchs and milkweed as she looks for milkweed in a field.
(01:47)The final leg of the Monarch's journey is studded by the threatening hungry mouths of praying mantises.
(02:26)Crew member talks about the plane they used to capture monarchs in flight.
(02:18)Migration Ecologist tests the first test ever of an electronic tag on a monarch butterfly.
(02:57)Cameramen chase down the monarchs flying around a field.
(01:00)After gorging on eucalyptus leaves, these bats begin their long courtship in the trees.
(02:54)Despite the dangers that await, many species are beginning their instinctual migratory treks through Africa.
(02:25)Species upon species converge in the Falkland Islands to end their migratory journeys in mating and birth.
(02:15)A zebra foal and his father catch up with the herd on its way back to the rich green lands of the delta.
(01:43)The mayfly is born, lives through middle-age, and then dies. All in the same day.
(02:41)