Hummingbirds

Hummingbirds represent one of nature's most interesting paradoxes. They are the smallest of birds, yet they qualify as some of the toughest and most energetic creatures on Earth. See how they shimmer like flashing jewels of the natural world. Shot in high-definition, this one-off special delves into these creatures remarkable abilities to help you understand the world of hummingbirds as you've never seen before. (Source: National Geographic Wild)