Guinness has announced the newest world record holders, and here is just a sampling of the equine-related world records:

Oklahoma Sam - World's Tallest Donkey
"Sam" is owned by Linda Davis in Watsonville, Calif., and has officially measured at 15.3 hands--a full 11 inches taller than her breed standard.

The 4-year-old really dwarfs her barn mates, which include a duck, goose, and four cats. That doesn't seem to bother them because, according to the profile, this animal family seems to get along quite well.

Linda wanted to point out that even though Sam is larger than normal donkeys, he's not any more expensive to maintain. "He doesn't eat more," she told Guinness. "In fact, if I give him more bale (of hay) he'll just use it to make his bedding more comfortable."

Here's a video from the Guinness site:

Thumbelina - World's Smallest Living Horse
For the past six years Thumbelina has retained the record as the smallest living horse, standing a mere 17.5 inches at the withers. She is owned by Kay and Paul Goessling in St. Louis, Mo.

Taff & Griff - World's Oldest Horse Twins
These identical Cremello geldings were born in 1982 and are owned by the Veteran Horse Society in Cardigan, North Pembrokeshire, U.K., where they retired together after giving pony rides at the London Zoo. They both stand 11.2 hands.

The Green Monkey - Most Expensive Horse Sold at Auction
In February 2006 a 2-year-old bay Thoroughbred colt by Forestry, named The Green Monkey, was sold at sale for 2-year-olds in training held at Calder Race Course in Florida for $16 million. Not a bad turn-around considering that a year earlier he was purchased for only $425,000 as a yearling.

However, the colt didn't materialize into much and was retired at the tender age of 4 to a farm in Ocala, Fla. He only raced three times, with his best effort coming in third. He stood for $5,000 in 2012.

JJS Summer Breeze - Longest Tail on a Horse
This registered Paint mare was rocking a tail that (officially) measured 12 feet six inches when she was measured in August 2007.

The 15-year-old mare is owned by Crystal Socha in Augusta, Kan., and was originally trained as a reining horse. Now she competes in local American Paint Horse Association shows in Western pleasure and horsemanship--all while keeping her tail wrapped up, according to the

Crystal keeps Summer's tail braided and folded up in a regular tube sock. She takes it out and washes it every couple of months, but doesn't use any conditioner because it can make the hair too slippery. Then she braids the tail, starting at the end of the tailbone, and folds it over itself, wraps with VetRap, and covers it in a sock. Seems so simple, huh?

Doc - Longest Distance Walked by a Horse on Hind Legs
Owner Gregory Ancelotti of Italy rode Doc to the record of 30 meters (95 feet 5 inches) in April 2009. I wish I had video to share with you!