The Rose-ringed Parakeets of Heidelberg
10,000 Birds
JANUARY 1, 2012
This is what happens when people choose their pet birds on visual factors alone without taking vocalizations into account. There are other more isolated populations, e.g. in Hamburg, Berlin, Rome, Paris, and Barcelona. The zoo has a small colony of genuinely wild Grey Herons (watch them compete with the seals for the fish!),
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