Cormorant - Wildlife Control Information

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6Biology andNatural HistoryDescription of the CormorantThe double-crested cormorant is along-lived, colonial-nesting water birdnative to North America. One of 38species of cormorants worldwide, andone of six species in North America, it is usuallyfound in flocks, and sometimes confused withgeese or loons when on the water (Table 1).Male and female cormorants look alike, havingblack plumage tinted with a greenish gloss onthe head, neck and underside. In breedingplumage, tufts or crests of feathers appear for aSTAN TEKIELAThe double-crested cormorant perches on trees, rocks, buoys, and other objects that overhang or project from water.
7Table 1Characteristics useful for field identification of Double-Crested Cormorantsversus Canada Geese or Common LoonsCanada Geese Common Loons Double-Crested CormorantsColorBlack, gray, buff and white,dark head and neck, lighterbodyBlack and white, black backevenly patterned with white inbreeding seasonUniformly dark, or mottledbrown and gray breastNeck C-shaped curve, long Short, curved Snake-like curve, longBill Long, flattened at tip Heavy with pointed tip Slender, cylindrical, hooked tipTail Shorter than cormorant Very short Much longer than geese or loonsWing beat Slower than cormorant or loon Faster than geese or cormorant Slower than loon, somewhatmore rapid than geeseNeck in flight Held horizontal Held slightly lower thanhorizontalHeld slightly higher thanhorizontalPerching position Remains on ground Ungainly on land Upright posture with curvingneck, tail used as brace, wingsoften spread; prefers trees,rocks, and buoys that overhangor project from waterPosition on waterSwims with most of body abovewaterSwims low in waterBody often nearly submerged,neck, more erect than loons,bill pointed at upward angleSTAN TEKIELALEE KARNEYWENDY VANDYK EVANSCanada gooseCommon loonDouble-crested cormorant
Page 2 and 3: AcknowledgementsFunding for this pu
Page 4 and 5: Lethal Management Options . . . . .
Page 6 and 7: 4IntroductionEven though breeding p
Page 10 and 11: 8short time on either side of the h
Page 12 and 13: 10egg hatches after about 25 days.
Page 14 and 15: 12Food Habits and FeedingDouble-cre
Page 16 and 17: 14These fish were collected from th
Page 18: 16Addition of cormorants as a nesti
Page 21 and 22: 19RICHARD CHIPMANUsing a variety of
Page 23 and 24: 21Lethal ManagementOptionsNest Dest
Page 25 and 26: 23Regulation and ManagementAuthorit
Page 27 and 28: 25New Strategies for ManagingCormor
Page 29 and 30: 27SummaryDouble-crested cormorantma
Page 31 and 32: 29the Yellow Perch population of th
Page 33 and 34: 31McCullough, R.D., and D.W. Einhou
Page 35 and 36: Unlike other water birds, the doubl

Cormorant - Wildlife Control Information

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