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BALLIVOR, Ireland — Legend has it that St. Patrick drove all the snakes out of Ireland. The economic crisis has brought some back.

During the Celtic Tiger boom, snakes became a popular pet among the Irish nouveau riche, status symbols in a country famous for its lack of indigenous serpents. But after the bubble burst, many snake owners could no longer afford the cost of food, heating and shelter, or they left the country in search of work. Some left their snakes behind or turned them loose in the countryside, leading to some startling encounters.

A California king snake was found late last year in a vacant store in Dublin, a 15-foot python turned up in a garden in Mullingar, a corn snake was found in a trash bin in Clondalkin in South Dublin, and an aggressive rat snake was kept in a shed in County Meath, northwest of Dublin.

“The recession is the thing that’s absolutely causing this,” said Kevin Cunningham, 37, who started the National Exotic Animal Sanctuary after he left his job at a Dublin nightclub. He has transformed an old single-room schoolhouse near Ballivor, a hamlet in the Meath countryside, into a reptile sanctuary.

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“It was about status,” Cunningham said as he waved to a 4-foot red iguana that was found under a sink in an abandoned house in Dublin. “During the boom, people treated these animals as conversation starters.”

Animals have always been abandoned in greater numbers in times of famine, economic hardship and mass emigration in Ireland, but in the past that usually meant farm animals.

The Dublin Society for the Prevention of Cruelty to Animals (DSPCA) was taking in five or six emaciated horses a week as recently as 2010. Now, though, snakes are more common among the foundlings, including a python named Basie that someone recently dropped by the side of a road.

“In the Tiger economy,” said P.J. Doyle, a reptile expert, “young people could pay 600 quid for a snake” and the necessary equipment — about $700 to $1,000 during much of the boom. But these days, he said, some owners “just drive up and throw them somewhere.”

Doyle helped the DSPCA brace for an influx of reptiles around, of all dates, St. Patrick’s Day, when the warmer weather means the coldblooded snakes will be more active and more likely to show themselves.

Irish legend holds that the country has no native snakes because St. Patrick banished them in the fifth century. But science says the country was snake-free long before Patrick’s time. When the glaciers of the most recent ice age retreated from the British Isles more than 10,000 years ago, Ireland was already separated from the rest of Europe by open sea, with a damp climate hostile to almost all reptiles.

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