Because they tend to move suddenly and in large numbers into human areas in search of food, people sometimes view the arrival of these birds as an invasion. Waxwings especially, which
Scientists have noted that waxwing tail bands have been both yellow and orange for the last thirty years. Prior to that time, their tail bands were always yellow. The scientists believe that waxwings have been eating a lot of berries from the introduced (not native) European honeysuckle, which was introduced about then. Scientists think that the birds are being affected by pigments in the orange fruit.
tend to fly into windows in suburban areas and to gorge on any berry-producing bushes, are occasionally considered pests.
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