Animal's All world

Prairie dogs kiss.
Prairie dogs are quirky creatures for a number of reasons: They're giant rodents, they dig massive interconnected underground homes, and they kiss. While they're actually touching their front teeth in order to identify each other when they seem to be sweetly sharing a smooch, the BBC explains that scientists believe prairie dogs "'kiss and cuddle' more when they are being watched by zoo visitors," because they "appeared to enjoy the attention."

The world's oldest known breed of domesticated dog dates back to 329 BC.
Dogs are well known for being man's best friend, and it turns out that's a relationship that goes back longer than you might expect. According to Guinness World Records, the oldest known breed of domesticated dog goes all the way back to 329 BC. "Saluki dogs were revered in ancient Egypt, being kept as royal pets and being mummified after death," they note. "There are carvings found in Sumer (present-day southern Iraq) which represent a dog, closely resembling a saluki, which date back to 7000 BC."

Narwhal tusks are really an "inside out" tooth.
Narwhals are unlike most other whales because they have what appears to be a giant tusk. But that's not actually a tusk at all—what you're seeing is a tooth. Harvard University's Martin Nweeia told the BBC that the "tooth is almost like a piece of skin in the sense that it has all these sensory nerve endings," adding that it's "essentially built inside out."

There's a kind of ant that only lives in a small area of Manhattan.
If you're ever in the area of "the Broadway medians at 63rd and 76th streets" in New York City, keep an eye on the ground for crawling critters and you might spot something rare. That's where the "ManhattAnt" can be found, an ant that only lives in the one small area of the city. "It's a relative of the cornfield ant, and it looks like it's from Europe, but we can't match it up with any of the European species," Rob Dunn, a biology professor at North Carolina State University, told the New York Post. Dunn and his team discovered the isolated ant variety in 2012.