A photographer could bear-ly believe his eyes when a bear started waving at him. The friendly animal wandered to the front of his enclosure before sitting back in full view of zoo guests. He then lifts his powerful paw and excitedly waves in an almost human-like way at his new audience. The hilarious encounter was captured by keen photographer Andrey Slepnev, 31, while on a trip to Madrid Zoo, Spain on March 24, 2016. (Photo by Andrey Slepnev/Caters News)

The photographs feature fish that have been specially treated to make the stained skeletal tissues visible through the skin and flesh. The technique, developed by Dr. Adam Summers, uses dyes, hydrogen peroxide, a digestive enzyme and glycerin to make the flesh seem to disappear. Photo: This image of the butterfly ray (Gymnura crebripunctata) helped scientists study the joints in its wings. (Photo by Adam Summers)

Ballroom dancers Andrei Toader and Mia Linnik-Holden compete in the “North of England Amateur Ballroom Dancing” competition at the 49th British National Dance Championships, in the Empress Ballroom of Blackpool's Winter Gardens, in Blackpool, north-west England, on November 21, 2024. The four-day British National Dance Championships have been taking place since 1975 with dancers competing in Ballroom and Latin dancing disciplines. (Photo by Oli Scarff/AFP Photo)

An Indonesian man displays his collection of rings with various gemstones at an exhibition and competition of the best gemstone at a mall in Jakarta on August 6, 2015. The recent fad of collecting rings with precious gemstone or polished gemstone locally called “batu akik” is sweeping across Indonesia, with collectors going for the very rare stones and it's possession many believe will give the owner supernatural power. (Photo by Bay Ismoyo/AFP Photo)

In this handout photo provided by Warner Brothers Pictures and Village Roadshow Pictures, Tom Cruise plays Lieutenant Colonel Bill Cage, a soldier who replays his last day while trying to fight aliens, in director Doug Liman's “All You Need Is Kill”. The film is set to premiere on March 14, 2014. (Photo by David James/Warner Brothers Pictures)

Some Iraqi candidates for Miss Iraq beauty contest pose in front of the Ishtar Gate at the ancient archaeological site of Babylon, outside the modern city of Hilla, south of the capital Baghdad on December 17, 2015. The beauty contest, which is the first one in more than 40 years, aims to boost tourism in the city and will take place on December 19, 2015. (Photo by Ahmad Al-Rubaye/AFP Photo)

Zhang Jinduo's wife tries on a self-made racing car on the outskirts of Shenyang, Liaoning province May 10, 2008. Zhang, the 53-year-old local farmer made the racing car with the help of his son who is a car mechanic. The car is equipped with a rear-mounted motorcycle engine and can achieve 60-80 km per hour, according to local media. (Photo by Reuters/Stringer)

A young USA fan smiles ahead of the 2019 Concacaf Gold Cup semifinal football match between USA and Jamaica on July 3, 2019 in Nashville, Tennessee. (Photo by Ricardo Arduengo/AFP Photo)