From the vimeo page:
Watch thousands of monarch butterflies as they migrate to Mexico. From Disneynature, the studio that brought you Earth, Oceans, African Cats and Chimpanzee, comes Wings Of Life -- a stunning adventure full of intrigue, drama and mesmerizing beauty. Narrated by Meryl Streep, this intimate and unprecedented look at butterflies, hummingbirds, bees, bats and flowers is a celebration of life, as a third of the world's food supply depends on these incredible -- and increasingly threatened -- creatures. Directed by acclaimed filmmaker Louie Schwartzberg, Wings of Life utilizes riveting high-speed, closer-than-close filmmaking techniques to showcase in spectacular detail these unsung heroes of our planet.