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A dwarf swan meanders by as zookeeper Yancy Rentz, left, and biologist Benjamin Ibler count ducks in a bird enclosure during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany. The zoo conducts the once-a-year inventory over a period of several months, depending on the species, to assess such factors as the state of animal colonies, the presence of foreign species and the true number of species and their members.
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A swan nibbles at a photographer's lens during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Biologist Benjamin Ibler watches a school of lookdown fish swim by at the aquarium during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin holds a woma python from Australia during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Biologist Benjamin Ibler measures a giant katydid during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin holds a woma python from Australia during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Yancy Rentz, left, and biologist Benjamin Ibler count ducks in a bird enclosure during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin strokes the head of a live rhinoceros iguana after measuring the lizard during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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A woma python from Australia lies on a clipboard during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin measures a live rhinoceros iguana during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Yancy Rentz, left, and biologist Benjamin Ibler count ducks as dwarf swans meander by in a bird enclosure during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin carries a live rhinoceros iguana in order to measure it during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Biologist Benjamin Ibler passes by an Asian elephant during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin, right, and biologist Benjamin Ibler measure Saskia, a Burmese python who is 3.2 meters long, during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Biologist Benjamin Ibler points to a Grants grouper fish at the aquarium during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Biologist Benjamin Ibler observes a colony of red waever ants during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin, center, measures Saskia, a Burmese python who is 3.2 meters long, during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin carries Saskia, a Burmese python who is 3.2 meters long, before measuring the snake during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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A giant grasshopper rests on the hand of a zookeeper during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.
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Zookeeper Thomas Warkentin rakes over sand as Burmese pythons look on after he measured one of the snakes during the annual animal inventory at Zoo Berlin zoo on Dec. 12, 2012, in Berlin, Germany.