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Birding: One good sighting does not necessarily deserve another Birders will always flock with news of a rare sighting, but based on science that doesn t increase chances of another rare sighting. By HERB WILSON Share Birders gather to watch a rare redwing, also known as a European thrush, at Capisic Pond Park in Portland on Jan. 30. Shawn Patrick Ouellette/Staff Photographer In the last column, I discussed a birding phenomenon that has been termed the Patagonia Picnic Table Effect or PPTE. The effect is basically a positive feedback loop. A birder finds a rare bird, other birders come to see the rarity and find other rare birds, drawing yet more birders who find yet more rare birds.

Capisic pondUnited statesColby collegeJesse haneyBrendan mckayFrank paulHerb wilsonOregon state universityPatagonia picnic table effectMississippi riverNorth americanகாப்சிக் பாஂட்ஒன்றுபட்டது மாநிலங்களில்கோல்பி கல்லூரிஜெஸ்ஸி ஹேநீபிரெண்டன் மகே