Stock Photo - 28 January 2021, Lower Saxony, Walsrode: The unfertilized hummingbird eggs are counted by an employee of the Walsrode Bird Park to determine the number of successful offspring. At the beginning of each year, the Walsrode Bird Park weighs, measures and counts in order to bring the lists and stock books up to date. Photo: Sina Schuldt/dpa. - Walsrode/Lower Saxony/Germany

Stock Photo: 28 January 2021, Lower Saxony, Walsrode: The unfertilized hummingbird eggs are counted by an employee of the Walsrode Bird Park to determine the number of.

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