Deltiology (from Greek δελτίον, deltion, diminuitive of δέλτος, deltos, "tablet, letter"; and -λογία, -logia) is the study and collection of postcards. Compared to philately, the iden- tification of a postcard's place and time of production can often be an impossible task because postcards, unlike stamps, are produced in a decentralised, unregulated manner. For this reason, some collectors choose to limit their acquisitions to cards by specific artists and publishers, or by time and location.
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047 - Romania

A dolphinarium is an aquarium for dolphins. The dolphins are usually kept in a large pool, though occasionally they may be kept in pens in the open sea, either for research or for public performances. Some dolphinariums consist of one pool where dolphins perform for the public, others have expanded into much larger parks, keeping other marine animals and having other attractions. These larger parks are often not considered to be dolphinariums themselves, but marine mammal parks or theme parks that include a dolphinarium. A dolphinarium can also be part of a zoo.
Though cetaceans have been held in captivity in both North America and Europe since the 1860s, the first being a pair of Beluga Whales in the New York museum, dolphins were first kept for paid entertainment in the Marine Studios dolphinarium founded in 1938 in St. Augustine, Florida. It was here that it was discovered that dolphins could be trained to perform tricks. Recognizing the success of Marine Studios, more dolphinariums keeping dolphins for entertainment followed. In the 1960s, keeping dolphins in zoos and aquariums for entertainment purposes became increased in popularity after the 1963 Flipper movie and subsequent Flipper television series. In 1966, the first dolphin was exported to Europe. In these early days, dolphinariums could grow quickly due to a lack of legislation and lack of concern for animal welfare. New legislation, most notably the 1972 Marine Mammal Protection Act in the United States, combined with a more critical view on animal welfare forced many dolphinariums around the world to close. As an example, during the early 1970s there were at least 36 dolphinariums and travelling dolphin shows in the United Kingdom, none of which still exist today, the last dolphinarium in the UK having closed its doors in 1993. A considerable number of dolphinariums remain elsewhere in Europe however. Japan is also home to a relatively large number of dolphinariums. Dolphinarium of Constanța was opened in 1972.

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