Writing on Stone Provincial Park, Milk River Valley, Alberta, Canada

Writing on Stone Provincial Park, Milk River Valley, Alberta, Canada

Yak bells for sale in Namche Bazaar, Nepal

Yak bells for sale in Namche Bazaar, Nepal

Yampa River flowing through Dinosaur National Monument, Colorado

Yampa River flowing through Dinosaur National Monument, Colorado

Yellow bellied marmot in Yellowstone National Park, Wyoming

Yellow-bellied marmot in Yellowstone National Park, Wyoming

Yellow headed blackbird in Flathead Valley, Montana

Yellow headed blackbird in Flathead Valley, Montana 

Yellow throated marten

Yellow throated marten

Young African elephants playing in Samburu National Reserve, Kenya

Young African elephants playing in Samburu National Reserve, Kenya

Zhangye Danxia Landform in Gansu, China

Zhangye Danxia Landform in Gansu, China