From ferocious lions to swimming penguins, this collection of artsy pictures from the Hagenbeck Zoo in Hamburg, Germany, will have you mesmerized. The zoo, which opened its gates in 1863 and has been run by the Hagenbeck family since 1907, was the first to use open enclosures surrounded by moats instead of barred cages to create a more natural setting. Encompassing several acres, the park houses animals from all over the world, including tropical sharks, Asian elephants, tigers, and lions. Click through this collection of artistic images that share the amazing beauty of the animals of this zoo.

May 13-17 is National Bike Week, which makes these adorable pictures of dogs on bikes so fitting. Along with being a fun way to get a bit of exercise while enjoying some fresh Spring air, jumping on a bike with your furry friend is great for the environment. Click through for a collection of happy pups enjoying a bicycle ride paired with helpful riding tips and products.

Celebrate National Pet Month with this collection of adorable pets that are as happy as they can be. From grinning guinea pigs to smiling cats, all of these pets are seriously cheery. The month of May is dedicated to sharing just how special animals are and the benefits of taking care of pets. Giving your favorite friend a cuddle lowers blood pressure and promotes good overall health — and shows your pet that you think he's special too. Click through for some instant animal love.

Source: Flickr user glennsajan, Instagram user raiment, Flickr user zebarnabe, and Instagram user tofuthebritishshorthair

Even if you're not a fan of horse racing, the running of the Kentucky Derby isn't just about the sport. From the hottest celebs that attended the event to sweet sips like mint juleps, the fun couldn't be stopped by this year's drizzle. The first race of the Triple Crown was met with mud splatters and a hot race, ending with Orb splashing through the finish line, making jockey Joel Rosario the first Dominican to win. Orb was the five-to-one favorite and burst out of the gates to run the track in 2:02.89. Click through for a few highlights from the running of the 139th Kentucky Derby.

You know those weird places where your pet loves to hang out? We discovered a collection of critters that enjoy relaxing in the oddest spots. From cats lounging in the tub to ones that cuddle in your favorite boots, these pets find awkward places the perfect locales for leisure time. And we also found a few hilarious pictures of our furry friends caught in the act of behaving badly.

Source: Flickr user Jason Persse, Instagram user protoolschris, and Instagram user playmaker85

May is the month to celebrate your special pet. From the excitement of the Kentucky Derby to the cuteness of baby ducklings, May begins with Save the Rhino Day and closes with Pink Flamingo Day, with several other animal-related holidays and events throughout. Check out this collection of cool must haves that commemorate National Pet Month and all the other special days in May.

Just about everywhere you turn there's a silly animal meme: advice animals, grumpy cats, and puns galore. These cute pictures of pets with commentary are shared like crazy on Instagram. From dogs who can't wait to make breakfast to cats telling it like it is, we've gathered 12 of the silliest snort-out-loud pet memes that guarantee a good laugh.

From Lil Bub hitting the Tribeca Film Festival to Justin Bieber hanging with his pet monkey, we've rounded up our favorite pictures of celebrities and animals from the month of April. It seems the theme of the month was enjoying some serious downtime with furry friends. Click through for a collection of snaps sharing sweet moments between celebrities and their favorite animals.

April is National Frog Month, dedicated to the loved (or loathed) amphibian. In honor of all things frog, we've rounded up a collection of adorable frog pictures paired with cool facts that might surprise you. Considered one of the oldest amphibians on the planet, frogs have inspired artists, writers, scientists, and dancers for years. Click through to learn more and celebrate the unique characteristics of frogs.

Celebrate Earth Day by picking up one of these eco-friendly pet essentials for your furry friend. From green cat litter to soft and cuddly all-natural pet mats, these products are made with the Earth and your pet in mind. Click through for a collection of 10 eco-friendly pet essentials that will make your life easier and are sure to become your furry friend's new favorites.

While selecting the perfect wedding dress, pick up a mini formal or tiny tux for your furry friend. From flouncy kitty gowns made from colorful tulle to smart tuxes for proud pups, we've found a collection of adorable wedding duds made just for pets. And, let's be honest: pictures of pets in formal wear are seriously sweet. Click through to find the perfect little bridesmaid or groomsman outfit for your furry friend and a few ideas for how to include pets in a memorable way on your special day.

There's nothing cuter than a few kitty sneezes, but when those achoos stick around, they may be a sign of an underlying issue. We reached out to an expert, Doctor of Veterinary Medicine Eva Radke of the East San Rafael Veterinary Clinic, to learn more about what to do when your cat has a case of the sniffles. Along with giving your cat lots of snuggles and extra attention, there are a few other things to take into consideration when your cat can't stop sneezing. Click through for Dr. Radke's helpful answers and insights.

Cats can't resist an empty box. The intrigue, the fun, and the opportunity for cozy cuddle all seem to temot our feline friends to jump in and explore. Cats are curious by nature, which makes this collection of kitties having a great time in cardboard boxes seriously adorable and the perfect thing for a quick chuckle. From cats who think they're invisible once tucked inside to ones that seem indignant at being bothered while having a bit of cat-in-the-box fun, click through for a few cats that can't get enough of a cardboard box.