My eBird Citizen Science Experiment
10,000 Birds
MARCH 5, 2015
In the northern Backa region of Serbia, in the mid-1970s there were more than 37,000 active nests of Rooks, while in 2009 there were less than 8500, indicating a loss of more than 76% over a time span of 35 years ( source ). The smallest rookery in Pancevacki Rit had a mere 4 nests, the largest 102 – on average, 31.5 nests per colony.
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