A huge herd of of hippopotamus crowd into a pool at the end of the dry season in Luangwa National Park, Zambia, Africa. (Photo by Mark Boulton/Ardea/Caters News)
Thousands of Monarch butterflies rest on a tree in North America. (Photo by Jean Paul Ferrero/Ardea/Caters News)
A huge flock of flamingos in Kenya, East Africa. (Photo by Ferrero-Labat/Ardea/Caters News)
A huge colony of Pacific Walrus on Arakamchechen Island in the Northern Bering Sea. (Photo by Francois Gohier/Ardea/Caters News)
Hundreds of wildebeest crossing a river during migration in Masai Mara National Reserve, Kenya. (Photo by Ferrero-Labat/Ardea/Caters News)
A colony of king penguins seen in South Georgia. (Photo by Jean Paul Ferrero/Ardea/Caters News)
Female red crabs after spawning on Christmas Island. (Photo by Jean Paul Ferrero/Ardea/Caters News)
Tightly packed knots seen in Snettisham, Norfolk, UK. (Photo by Chris Knights/Ardea/Caters News)
A mass of honeybees. (Photo by M. Watson/Ardea/Caters News)
Common zebras seen in Masai Mara, Africa. (Photo by Ferrero-Labat/Ardea/Caters News)
A huge school of salmon seen in the waters of Hawaii. (Photo by Valerie Taylor/Ardea/Caters News)
A huge group of great Indian horseshoe bats nesting in Bandhavgarh NP, India. (Photo by M. Watson/Ardea/Caters News)
A huge herd of African Cape Buffalo kicking up dust in Botswana. (Photo by Chris Harvey/Ardea/Caters News)
Blue and yellow snapper fish seen in moving vast schools along the reef in Fiji. (Photo by Ron & Valerie Taylor/Ardea/Caters News)
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