Meerkats of the mongoose family at the Leningrad Zoo marking its 150th anniversary.

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A toad at the exotarium of Leningrad Zoo, which is celebrating its 150th anniversary this year.

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Visitors at the exotarium of the Leningrad Zoo marking its 150th anniversary.

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Staff reading the stands with the history of the Leningrad Zoo marking its 150th anniversary.

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A boy at an exotarium of the Leningrad Zoo marking its 150th anniversary.

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Markhor Mukhomor at the Leningrad Zoo marking its 150th anniversary.

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A tiger the Leningrad Zoo marking its 150th anniversary.

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Visitors at a polar bear enclosure at the Leningrad Zoo marking its 150th anniversary.

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A tiger the Leningrad Zoo marking its 150th anniversary.

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A lar gibbon at the Leningrad Zoo marking its 150th anniversary.

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Giraffes at the Leningrad Zoo marking its 150th anniversary.

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A Steller's sea eagle at the Leningrad Zoo marking its 150th anniversary.

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A nine-banded armadillo presented by the Tallin Zoo on the Leningrad Zoo's 150th anniversary.

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Visitors at the exotarium of the Leningrad Zoo marking its 150th anniversary.

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Uslada, a polar bear and a symbol of the Leningrad Zoo. The zoo is marking its 150th anniversary.

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Visitors at a polar bear enclosure at the Leningrad Zoo marking its 150th anniversary.

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Children playing with a goat at the Leningrad Zoo marking its 150th anniversary.

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Visitors at a monkey enclosure at the Leningrad Zoo marking its 150th anniversary.

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A lar gibbon at the Leningrad Zoo marking its 150th anniversary.

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A little lar gibbon at the Leningrad Zoo marking its 150th anniversary.

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A red-tailed monkey at the Leningrad Zoo marking its 150th anniversary.

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Staff installing stands telling about the history of the Leningrad Zoo marking its 150th anniversary.

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Visitors at the entrance to the Leningrad Zoo marking its 150th anniversary.

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Entrance to the Leningrad Zoo marking its 150th anniversary.

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Visitors at a giraffe enclosure at the Leningrad Zoo marking its 150th anniversary.

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Polar bear Menshikov, a symbol of the Leningrad Zoo marking its 150th anniversary.

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Uslada, a polar bear and a symbol of the Leningrad Zoo. The zoo is marking its 150th anniversary.

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Markhors at the Leningrad Zoo marking its 150th anniversary.

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A tiger the Leningrad Zoo marking its 150th anniversary.

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A white-tailed eagle at the Leningrad Zoo marking its 150th anniversary.

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