Following the series of nature images of April 2011, the National Geographic Magazine has released the issues of best pictures in May 2011. The most astonishing photos of the month feature amazing scenes of Lago di Olginate in Italy, Agkistrodon piscivorus and Matterhorn towers.
Lago di Olginate, Italy
This picture amazingly captures the think layer of clouds over the valley near the south of Lake Como, northern Italy. In the above image, the dense cloud hides almost the valley and leaves some artificial lights that make the city like an opaque blanket. The village over distance is clearly seen out of the blanket.

Lago di Olginate, Italy
Freestone Climb, Yosemite Falls

Kate Rutherford is doing a climb just close to the Yosemite Falls in the climbing route Freestone. Despite the close distance, she can not hear the roar.
Matterhorn

Matterhorn towers, near the Riffel Lake in Zermatt, looks stunning at sunrise
Arches National Park

The entire Milky Way teeters are seen over the Balanced Rock in Arches National Park
Lightning, Arizona

A huge lighting strikes over the sky of Scottsdale, Arizona.
Cottonmouth, North Carolina

While working on the North Carolina, the field researcher Jared Skye captured this Agkistrodon piscivorus in a classic defensive posture.
Polar Bear and Cub, Svalbard

The mother polar bear is shaking herself dry while the baby one rides on her back.
Spring Field

The February sun is shining over the meadow waiting for the coming of spring
Badab Sourt Spring, Iran

A woman standing in Badab Sourt Spring situated in the Alborz mountains, Iran at the altitude of 1,840 meters.
El Capitan, Yosemite National Park

The image demonstrates the reflection of El Capitan into the Merced River, Yosemite National Park.
Best Nature Photos of April 2011