This week saw a number of great animal stories to bring you holiday cheer. The National Zoo in Washington, D.C. announced that Billie Jean, an Andean bear, is pregnant with twins! If she carries her cubs to term, they will be the only surviving Andean cubs in a North American zoo since the birth of Billie Jean’s first cubs. This news is especially poignant since her mate, Nikki, was euthanized in August after a long struggle with cancer.

The scientific community has chosen to honor President Obama by naming a new species of fish after him. Etheostoma obama, a newly discovered freshwater darter, lives in Tennessee rivers and creeks. "We chose President Obama for his environmental leadership, particularly in the areas of clean energy and environmental protection, and because he is one of our first leaders to approach conservation and environmental protection from a more global vision," the researchers said.

Farther up north from the new fish species, wild horses are at the center of a land dispute in Kentucky. Sequoia Energy is trying to rid the horses from a former mining site, while the Humane Society of Kentucky argues that landowners have given permission for the animals to remain. "Just leave the horses alone, that's all we want out of it," Humane Society president Marcella Chadwick said Tuesday.

Meanwhile, stray dogs are finding sanctuary across the world in Sarajevo, where a law stops them from being killed. Although other regions in Bosnia have ignored the edict, the law is respected in the capital city, thanks to a government-supported dog shelter that performs sterilizations.

As the year wraps up, Vetstreet has announced their list of Most Popular Puppy Names Of 2012. Click here to find out if your pooch made the top 10.

If you have a cute pet, make sure to submit a photo to our Cutest Pets of 2012 slideshow.

Find some of the week's best animal photos below:

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  • One of three orphaned tiger cubs rests near Swiss Shepherd dog Talli's puppies in the Russian Black Sea resort of Sochi, on December 4, 2012. Three little tigers, two male and one female cubs, were born last month in the Oktyabrsky Zoo in Sochi but abandoned by their birth mother, tigress Bagira. MIKHAIL MORDASOV/AFP/Getty Images

  • Japanese macaque, commonly referred to as 'snow monkeys', take an open-air hot spring bath, or 'onsen' at the Jigokudani (Hell's Valley) Monkey Park in the town of Yamanouchi, Nagano prefecture on December 7, 2012. Some 160 of the monkeys inhabit the area and are a popular tourist draw. KAZUHIRO NOGI/AFP/Getty Images

  • Japanese macaque, commonly referred to as 'snow monkeys', take an open-air hot spring bath, or 'onsen' at the Jigokudani (Hell's Valley) Monkey Park in the town of Yamanouchi, Nagano prefecture on December 7, 2012. Some 160 of the monkeys inhabit the area and are a popular tourist draw. KAZUHIRO NOGI/AFP/Getty Images

  • A zoo keeper holds the new born penguin (Spheniscus Demersus) in the zoo in Budapest, Hungary on December 8, 2012. Junior was born on September. FERENC ISZA/AFP/Getty Images

  • One of three orphaned tiger cubs rests at the home of Natalia Stepanova, a veterinarian of the Oktyabrsky Zoo, in the Russian Black Sea resort of Sochi, on December 4, 2012. The three little tigers, two male and one female cubs, were born last month in the Oktyabrsky Zoo in Sochi but abandoned by their birth mother, tigress Bagira. MIKHAIL MORDASOV/AFP/Getty Images

  • An egret catches a lizard during the final round of the LPGA Qualifying School at LPGA International on December 2, 2012 in Daytona Beach, Florida. (Photo by Sam Greenwood/Getty Images)

  • An American Anhinga catches a fish during the final round of the LPGA Qualifying School at LPGA International on December 2, 2012 in Daytona Beach, Florida. (Photo by Sam Greenwood/Getty Images)

  • In this Thursday, Dec. 6, 2012 photo, a rescued loggerhead turtle swims under its reflection in a tank at the New England Aquarium's Animal Care Center in Quincy, Mass. Some 207 sea turtles have stranded on Cape Cod this fall. That exceeds the 50-to-200 range that typically are stranded in the season from October to December. (AP Photo/Elise Amendola)

  • A hummingbird flies close to a flower during the Birding Rally Challenge at 'Aguas Calientes' Cuzco on December 05, 2012. The Birding Rally Challenge is a competition, involving teams of well known birders, where participants must cover the greatest number of habitats within a relative small geographical area and in a limited amount of time, allowing them to appreciate the biodiversity of Peru. ERNESTO BENAVIDES/AFP/Getty Images

  • Two Australian Parrots (Alisterus Scapularis) remain on a branch at the Abraham Lincoln park in Mexico City on December 5, 2012. OMAR TORRES/AFP/Getty Images

  • A hummingbird flies arround a flower during the Birding Rally Challenge at 'Aguas Calientes' near the Machu Picchu sanctuary in Cuzco on December 05, 2012. The Birding Rally Challenge is a competition, involving teams of well known birders, where participants must cover the greatest number of habitats within a relative small geographical area and in a limited amount of time, allowing them to appreciate the biodiversity of Peru. ERNESTO BENAVIDES/AFP/Getty Images

  • A group of Black Headed Gull seagulls stand on a pole in Stockholm, Sweden on December 6, 2012. JONATHAN NACKSTRAND/AFP/Getty Images

  • A woman feeds tomtits in a park in the Belarus capital Minsk, on December 7, 2012. VIKTOR DRACHEV/AFP/Getty Images

  • A young polar bear wallows in snow at the public zoo in the Russia's second city of Saint-Petersburg, on December 7, 2012. OLGA MALTSEVA/AFP/Getty Images

  • Young deer cross the 16th fairway during the second round of the MCB Tour Championship played at the Legends Course, Constance Belle Mare Plage on December 8, 2012 in Poste de Flacq, Mauritius. (Photo by Phil Inglis/Getty Images)

  • Young deer cross the 16th fairway during the second round of the MCB Tour Championship played at the Legends Course, Constance Belle Mare Plage on December 8, 2012 in Poste de Flacq, Mauritius. (Photo by Phil Inglis/Getty Images)

  • A two weeks old baby hippopotamus is pictured at in it enclosure at Zoo Berlin on December 7, 2012 in Berlin. JOHANNES EISELE/AFP/Getty Images

  • A baby hippopotamus born November 23 swims with its mother at Zoo Berlin on December 7, 2012 in Berlin, Germany. The baby hippo is a boy and has two sisters. (Photo by Sean Gallup/Getty Images)

  • A monkey sits on top of a car as it eats an orange snatched from a fruit vendor in New Delhi on December 5, 2012. Delhi’s monkey population has grown large and aggressive but monkeys are the living representatives of the cherished Hindu god Hanuman, and Hindu tradition calls for feeding monkeys twice a week. SAJJAD HUSSAIN/AFP/Getty Images

  • A Grey Seal (Halichoerus Grypus) swims in the water in the zoo in Budapest, Hungary on December 8, 2012. FERENC ISZA/AFP/Getty Images

  • In this photo provided by the San Diego Zoo, Riki-san, a 14-week-old clouded leopard at the San Diego Zoo, and his brother, Haui-san, unseen, make their public debut at the San Diego Zoo Thursday, Dec. 6, 2012. According to zookeepers, 13-pound Riki-san, although larger than his brother Haui-san, is the more timid cat and his coat pattern is darker and his rosettes more pronounced. The two male cubs arrived earlier this week from the Nashville Zoo at Grassmere, where a very successful breeding program has helped to increase the population of this critically endangered species. (AP Photo/San Diego Zoo, Ken Bohn)