Birds of North America
Puzzle 71 · Islands and Open Seas · Page 99 in print
Arctic Tern
Arctic Terns leave northern breeding areas for waters near Antarctica, spending their nonbreeding season along pack ice during the Southern Hemisphere’s summer.
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Angular Wings
The sharply angled outline of the wings.
Antarctica
The region of the species’ nonbreeding season.
Bent Posture
A warning stance directed at intruders.
Bill Fencing
A fighting action used in nest defense.
Carpal Bar
A dark shoulder mark on nonbreeding birds.
Food Offering
A male courts the female by bringing food.
Gray Belly
The gray underside of a breeding adult.
Nest Rim
The edge where a sitting bird may add nearby material.
Offshore Route
A common migration path away from land.
Pack Ice
Sea ice along which birds spend the southern summer.
Plunge Dive
A shallow dive used to catch fish.
Predatory Fish
Fish whose hunting pushes smaller prey toward the surface.
Red Legs
The breeding adult’s leg color.
Scaly Back
The patterned upperparts of a juvenile.
Short Legs
A feature of the species’ compact standing profile.
Sources
- Arctic Tern: IdentificationCornell Lab of Ornithology
- Arctic Tern: Life HistoryCornell Lab of Ornithology