April 17 2012

Australia, Canada, China, Germany, France, United Kingdom

Cotton-top or Pinché tamarin of northern Colombia

(© Thomas Marent/Corbis)

 United Kingdom

U.S. dollar coins

(© Guy Cali/FogStock/Aurora Photos)

Japan

Two males fight Hippo in Kruger National Park, South Africa

(© Nigel Dennis/Gallo Images/Getty Images)

New Zealand

Opuntia, Prickly pear cactus

(© Flowerphotos/Superstock)