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Ghost Crabs Growls Using Teeth In Their Stomachs

Crabs may be able to intimidate other creatures with their claws, but if that's not enough, ghost crabs will growl at their enemies like a dog. However, unlike our canine friends, crabs make these fearsome noises using teeth located in their stomachs. "There are three main teeth—a medial tooth and two lateral teeth—that are essentially elongated, hard (calcified) structures. They are part of the gastric mill apparatus in the stomach, where they rub against each other to grind up food," Jennifer Taylor, from the University of California, San Diego, told Newsweek. She and her colleagues were able to nail down the source of the noise after noticing that "the crabs [were] 'growling' at" them.

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The World's Oldest Known Breed Of Domesticated Dog Dates Back To 329 BC

ShutterstockDogs 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."