A flock of macaques, which were rescued from smugglers, snuggle next to each other to warm themselves in the cold weather at the Wild Animal Rescue Center of Hubei in China.
An eagle-owl, which grew up in captivity, rests at the Russian Falcon Center in Moscow.
Ruddy shelducks and mergansers look for food on the Hunhe River in Shenyang in northeast China's Liaoning province.
A leerfish swims in a newly renovated aquarium in Piran, in southwestern Slovenia.
A month old Malay Fish Owl flaps about the breeding center at the Jurong BirdPark in Singapore.
Penguins are seen at the Bayworld Museum in Port Elizabeth, South Africa.
A transparent sea cucumber swims at a depth of 9,200 feet in the northern Gulf of Mexico.
A sea turtle hatchling makes its way to the sea after being released at a beach in Sanur, Bali, Indonesia.
Swans swim in a small lock after council workers rounded up them from Lake Alster, in the inner city of Hamburg, Germany.
A tiny copepod -- a group of small crustaceans -- was collected this year from the depths of the Atlantic Ocean.
The twig catfish is one of the Smithsonian National Zoo's best camouflaged creatures.