Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
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Michael Pearce / The Wichita Eagle
Max Thompson looks at a pine siskin seconds before releasing it with a leg band.
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Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
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| Buy this photo
Michael Pearce / The Wichita Eagle
After being affixed with a leg band, a pine siskin flies from Max Thompson's hand.
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Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
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Michael Pearce / The Wichita Eagle
Pine siskins in a tree are part of several hundred in one Winfield backyard most days.
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Michael Pearce / The Wichita Eagle
Max Thompson takes pine siskins from a trap, so he can affix research bands to their legs.
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Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
After being affixed with a leg band, a pine siskin flies from Max Thompson's hand.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
After being affixed with a leg band, a pine siskin flies from Max Thompson's hand.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
After being affixed with a leg band, a pine siskin flies from Max Thompson's hand.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
Pine siskins at a feeder in Winfield Thursday morning. Biologists report the "invasion" of siskins is especially heavy in south-central Kansas this winter.
Link to image
| Buy this photo
Michael Pearce / The Wichita Eagle
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